Document and Entity Information Statement [Table] Statement REVENUE RECOGNITION Commodity Sales Contracts and Marketing Entity Registrant Name Entity Central Index Key Document Type Current Fiscal Year End Date Document Fiscal Year Focus Document Fiscal Period Focus Document Period End Date Amendment Flag Entity Current Reporting Status Entity Filer Category Entity Small Business Entity Emerging Growth Company Trading Symbol Entity Common Stock, Shares Outstanding Condensed Consolidated Balance Sheets Assets, Current [Abstract] CURRENT ASSETS Cash Accounts Receivable, Net, Current Trade receivables Inventory, Net Inventories Total Other Assets, Current Other current assets, net Other current assets, net Assets, Current Total current assets Property, Plant and Equipment, Gross PROPERTY, PLANT AND EQUIPMENT Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Accumulated depreciation, depletion and amortization Property, Plant and Equipment, Net Total property, plant and equipment, net Other Assets, Noncurrent OTHER ASSETS Assets TOTAL ASSETS Liabilities, Current [Abstract] CURRENT LIABILITIES Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. Debt Instrument Carrying Amount Current Less Current Maturities Current maturities of long-term debt Accounts Payable, Current Accounts payable Accrued Liabilities, Current Accrued liabilities Accrued liabilities Liabilities, Current Total current liabilities Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt, classified as noncurrent. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. Debt Instrument Carrying Amount Noncurrent LONG-TERM DEBT Long-term debt Carrying value as of the balance sheet of the deferred gain (loss) and issuance costs, net. Deferred Gain (Loss) and Issuance Costs, Net DEFERRED GAIN AND ISSUANCE COSTS, NET Net deferred gain and issuance costs Other Liabilities, Noncurrent OTHER LONG-TERM LIABILITIES Redeemable Noncontrolling Interest, Equity, Carrying Amount [Abstract] MEZZANINE EQUITY Redeemable Noncontrolling Interest, Equity, Carrying Amount Balance at the end of the period Balance at the beginning of the period Redeemable noncontrolling interests Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] EQUITY Preferred Stock, Value, Issued Preferred stock (20 million shares authorized at $0.01 par value) no shares outstanding at March 31, 2019 and December 31, 2018 Common Stock, Value, Issued Common stock (200 million shares authorized at $0.01 par value) outstanding shares (March 31, 2019 - 48,800,217 and December 31, 2018 - 48,650,420) Additional Paid in Capital, Common Stock Additional paid-in capital Retained Earnings (Accumulated Deficit) Accumulated deficit Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive loss Stockholders' Equity Attributable to Parent Total equity attributable to common stock Stockholders' Equity Attributable to Noncontrolling Interest Equity attributable to noncontrolling interests Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Ending balance Beginning balance Total equity Liabilities and Equity TOTAL LIABILITIES AND EQUITY Preferred Stock, Shares Authorized Preferred stock, authorized shares Preferred Stock, Par or Stated Value Per Share Preferred stock, par value (in dollars per share) Preferred Stock, Shares Outstanding Preferred stock, outstanding shares Common Stock, Shares Authorized Common stock, authorized shares Common Stock, Par or Stated Value Per Share Common stock, par value (in dollars per share) Common Stock, Shares, Outstanding Common stock, outstanding shares Condensed Consolidated Statements of Operations Revenues [Abstract] REVENUES AND OTHER Revenue from Contract with Customer, Excluding Assessed Tax Oil and gas sales Gain (Loss) on Derivative Instruments, Net, Pretax Net derivative loss from commodity contracts Other Operating Income Other revenue Revenues Total revenues and other No definition available Costs and Other Deductions [Abstract] COSTS AND OTHER Production Costs, Period Cost Production costs Selling, General and Administrative Expense General and administrative expenses Depreciation, Depletion and Amortization Depreciation, depletion and amortization Taxes, Miscellaneous Taxes other than on income Exploration Expense Exploration expense Other Operating Income (Expense), Net Other expenses, net Total costs of sales, operating expenses, and nonoperating expenses for the period. Costs and Other Deductions Total costs and other Operating Income (Loss) OPERATING INCOME Nonoperating Income (Expense) [Abstract] NON-OPERATING (LOSS) INCOME Pre-tax interest expense Interest and debt expense, net Gain (Loss) on Repurchase of Debt Instrument Net gain on early extinguishment of debt Net gain on early extinguishment of debt Other Nonoperating Expense Other non-operating expenses Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest (LOSS) INCOME BEFORE INCOME TAXES Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net (loss) income NET (LOSS) INCOME Net Income (Loss) Attributable to Noncontrolling Interest [Abstract] NET (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS Noncontrolling Interest in Net Income (Loss) Joint Venture Partners, Redeemable Mezzanine equity Net (loss) income attributable to noncontrolling interests Noncontrolling Interest in Net Income (Loss) Joint Venture Partners, Nonredeemable Equity Net (loss) income attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Net income attributable to noncontrolling interests Net (income) loss attributable to noncontrolling interests Net Income (Loss) Attributable to Parent Net income (loss) attributable to common stock NET LOSS ATTRIBUTABLE TO COMMON STOCK Net loss attributable to common stock EARNINGS PER SHARE Net loss attributable to common stock per share Earnings Per Share, Basic Basic (in dollars per share) Basic EPS (in dollars per share) Earnings Per Share, Diluted Diluted EPS (in dollars per share) Diluted (in dollars per share) Condensed Consolidated Statements of Comprehensive Income Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Other comprehensive income items: Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), Net of Tax Reclassification of realized losses on pension and postretirement benefits to income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive loss attributable to common stock Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax Pension and postretirement income, associated tax Condensed Consolidated Statements of Cash Flows Net Cash Provided by (Used in) Operating Activities [Abstract] CASH FLOW FROM OPERATING ACTIVITIES Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net (loss) income to net cash provided by operating activities: Derivative, Gain (Loss) on Derivative, Net Net derivative loss from commodity contracts The net proceeds (payments) on derivative settlements, which increase (reduce) net income and are thus added (deducted) when calculating cash provided by or used in operating activities. Proceeds (Payments) on Derivative Settlements to Reconcile Net Income Loss to Cash provided by Used in Operating Activities Net proceeds (payments) on settled commodity derivatives The amount of amortization of deferred gains and deferred debt issuance costs. Amortization Of Deferred Gains And Debt Issuance Cost Amortization of deferred gain Results of Operations, Dry Hole Costs Dry hole expenses Other Noncash Income (Expense) Other non-cash charges to income, net Increase (Decrease) in Operating Capital Changes in operating assets and liabilities, net Net Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] CASH FLOW FROM INVESTING ACTIVITIES Payments to Acquire Property, Plant, and Equipment Capital investments Represents the information pertaining to changes in capital investment accruals Increase Decrease In Capital Investment Accrual Changes in capital investment accruals The cash outflows related to purchasing assets other than capital expenditures, including assets acquired as the result of a merger. Purchase of Assets, Net Acquisitions Payments for (Proceeds from) Other Investing Activities Other Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Financing Activities [Abstract] CASH FLOW FROM FINANCING ACTIVITIES Proceeds from Lines of Credit Proceeds from 2014 Revolving Credit Facility Repayments of Lines of Credit Repayments of 2014 Revolving Credit Facility Repayments of Subordinated Debt Debt repurchases Proceeds from Noncontrolling Interests Contributions from noncontrolling interest holders, net Contribution net of transaction costs Payments of Ordinary Dividends, Noncontrolling Interest Distributions paid to noncontrolling interest holders Proceeds from Issuance of Common Stock Issuance of common stock Payments of Shares Cancelled for Taxes Shares canceled for taxes Net Cash Provided by (Used in) Financing Activities Net cash provided by financing activities Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Increase in cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash-end of period Cash-beginning of period Condensed Consolidated Statements of Equity Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Parent [Member] Equity Attributable to Common Stock Retained Earnings [Member] Accumulated (Deficit) Earnings Accumulated Other Comprehensive Income [Member] Accumulated Other Comprehensive (Loss) Income Noncontrolling Interest [Member] Equity Attributable to Noncontrolling Interests Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (decrease) in Equity Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest Net loss Noncontrolling Interest, Increase from Sale of Parent Equity Interest Contributions from noncontrolling interest holders, net Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Distributions to noncontrolling interest holders Stock Issued During Period, Value, New Issues Issuance of common stock Other Comprehensive Income (Loss), Net of Tax Other comprehensive income Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Share-based compensation, net No definition available. THE SPIN-OFF AND BASIS OF PRESENTATION The entire disclosure for the spin-off and basis of presentation. Basis of presentation describes the underlying basis used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS). Spin Off and Basis of Presentation Text Block THE SPIN-OFF AND BASIS OF PRESENTATION ACCOUNTING AND DISCLOSURE CHANGES New Accounting Pronouncements and Changes in Accounting Principles [Text Block] ACCOUNTING AND DISCLOSURE CHANGES Other Information abstract OTHER INFORMATION The entire disclosure for Other information. OTHER INFORMATION. OTHER INFORMATION INVENTORIES Inventory Disclosure [Text Block] INVENTORIES DEBT Long-term Debt [Text Block] DEBT JOINT VENTURES Equity Method Investments and Joint Ventures Disclosure [Text Block] JOINT VENTURES LAWSUITS, CLAIMS, COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] LAWSUITS, CLAIMS, COMMITMENTS AND CONTINGENCIES DERIVATIVES Derivative Instruments and Hedging Activities Disclosure [Text Block] DERIVATIVES Earnings Per Share [Text Block] EARNINGS PER SHARE PENSION AND POSTRETIREMENT BENEFIT PLANS Pension and Other Postretirement Benefits Disclosure [Text Block] PENSION AND POSTRETIREMENT BENEFIT PLANS REVENUE RECOGNITION Revenue from Contract with Customer [Text Block] REVENUE RECOGNITION LEASES Lessee, Operating Leases [Text Block] LEASES INCOME TAXES Income Tax Disclosure [Text Block] INCOME TAXES n/a ASSET DIVESTITURE The entire disclosure for asset divestiture. ASSET DIVESTITURE [Text Block] ASSET DIVESTITURE Basis of Accounting, Policy [Policy Text Block] Basis of Presentation Schedule of Other Current Assets [Table Text Block] Schedule of other current assets, net Schedule of Accrued Liabilities [Table Text Block] Schedule of accrued liabilities Schedule of Inventory, Current [Table Text Block] Schedule of Inventories Schedule of Long-term Debt Instruments [Table] Debt Instrument [Line Items] Debt instrument Debt Schedule of Long-term Debt Instruments [Table Text Block] Schedule of Debt Tabular disclosure of non-redeemable and redeemable noncontrolling interest. Non-redeemable and Redeemable Noncontrolling Interest [Table Text Block] Schedule of changes in noncontrolling interests Derivative [Table] Derivative [Line Items] Schedule of Derivative Instruments [Table Text Block] Schedule of oil hedge positions Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Schedule of fair value (at gross and net) of outstanding derivatives Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Calculation of basic and diluted EPS Schedule of Net Benefit Costs [Table Text Block] Components of the net periodic benefit costs Revenue, Initial Application Period Cumulative Effect Transition [Table] Revenue, Initial Application Period Cumulative Effect Transition [Line Items] Revenue recognition Disaggregation of Revenue [Table Text Block] Schedule of disaggregated revenue Lease, Cost [Table Text Block] Schedule of operating lease costs, including amounts capitalized to property, plant and equipment The tabular disclosure of the presentation of the operating lease balance sheet accounts and other information. Lease Operating Balance Sheet Presentation And Other Information [Table Text Block] Schedule of supplemental balance sheet information related to operating leases Lessee, Operating Lease, Liability, Maturity [Table Text Block] Schedule of maturities of our operating lease liabilities Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Schedule of future minimum lease payments for noncancelable operating leases New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Recently Issued Accounting and Disclosure Changes Operating Lease, Right-of-Use Asset Right-of-use asset Operating lease right-of-use assets, net Operating Lease, Liability Present value of lease liabilities Total operating lease liabilities Operating lease liability Restricted Cash and Cash Equivalents Cash restricted for capital investments and distributions to a joint venture (JV) partner Derivative Asset, Current Derivative assets Amount due from joint venture partners included in Other current assets Amounts due from joint interest partners Prepaid Expense, Current Prepaid expenses Other Receivables Other Employee-related Liabilities, Current Accrued employee-related costs Interest Payable, Current Accrued interest Accrual for Taxes Other than Income Taxes, Current Accrued taxes other than on income Asset Retirement Obligation, Current Asset retirement obligation Operating Lease, Liability, Current Current liabilities Operating lease liability The current portion of accrued distributions attributable to noncontrolling interest. Accrued Distributions, Noncontrolling Interest, Current Accrued distribution to JV partner Other Accrued Liabilities, Current Other Asset Retirement Obligations, Noncurrent Non-current asset retirement obligation Represents increase in aggregate amount of asset retirement obligations due to adoption of new regulations. Increase in Aggregate Amount of Asset Retirement Obligations Due to Adoption of New Regulations Increase in the aggregate amount of ARO as a result of the adoption of new regulations Interest Paid, Net Interest paid, net of capitalized amounts Other Inventory, Supplies, Gross Materials and supplies Inventory, Finished Goods, Gross Finished goods Long-term Debt, Type [Axis] Longterm Debt Type [Domain] Long-term Debt, Type [Domain] Represents the senior notes payable that bear an interest rate of 5.00 percent and will mature in 2020. Senior Notes500 Percent Due2020 [Member] 5% Notes Due 2020 Represents the senior notes payable that bear an interest rate of 5.50 percent and will mature in 2021. Senior Notes550 Percent Due2021 [Member] 5.5% Notes Due 2021 Long-term Debt, Unclassified [Abstract] Debt Repurchases of debt Total debt Total debt Debt carrying value Debt Instrument, Basis Spread on Variable Rate Interest rate added to variable rate basis (as a percent) Debt Instrument, Interest Rate, Stated Percentage Debt instrument interest rate stated percentage Period before maturity of the second debt that triggers accelerated payment when the first debt matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but not limited to, weeks in a year or quarter. Period Before Maturity of Second Debt, Maturity of First Debt that Triggers Accelerated Payment Period before maturity of the 2016 Credit Agreement notes that triggers accelerated payment The outstanding amount of certain notes that triggers the acceleration of the maturity of debt instrument under a credit agreement. Debt Instrument Covenant, Outstanding Amount, Maturity Trigger Outstanding amount of 2016 Credit Agreement notes that triggers accelerated payment Amount of long-term debt payable in June 2021. Long Term Debt Maturities Repayments Of Principal In June 2021 Principal amount due by June 2021 Amount of long-term debt payable in December 2021. Long Term Debt Maturities Repayments Of Principal In December 2021 Principal amount due by December 2021 Amount of long-term debt payable in June 2022. Long Term Debt Maturities Repayments Of Principal In June 2022 Principal amount due by June 2022 Amount of long term debt payable in December 2022. Long Term Debt Maturities Repayments Of Principal In December 2022 Principal amount due by December 2022 The amount of debt premium that was originally recognized on exchange of the instrument that has yet to be amortized. Debt Instrument Unamortized Premium On Exchange Of Debt Deferred gains Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Deferred issuance costs and original issue discounts Line of Credit Facility, Current Borrowing Capacity Available borrowing capacity before a month-end minimum liquidity requirement Line of Credit Facility, Maximum Borrowing Capacity Maximum borrowing capacity Amount of minimum monthly liquidity required to maintain, per debt covenant agreement. Debt Instrument Covenant Minimum Monthly Liquidity Financial covenant minimum month end liquidity The amount of money that maybe borrowed based on the value of the collateral the entity pledges. Debt Borrowing Base Borrowing base Maximum borrowing capacity of letters of credit as sub-limit of the main credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. Line Of Credit Facility Maximum Borrowing Capacity Letters Of Credit Sublimit Maximum sub-limit on borrowing capacity for issuance of letters of credit Letters of Credit Outstanding, Amount Aggregate letters of credit issued Face (par) amount of the original debt instrument that was repurchased during the period. Debt Instrument, Repurchased Face Amount1 Principal amount of debt reduction through payment or repurchase Early Repayment of Senior Debt Repurchase value of the principal amounts Gains (Losses) on Extinguishment of Debt Pre-tax gain on extinguishment of debt, net of a reduction in deferred issuance costs Long-term Debt, Fair Value Estimated fair value of long-term debt Noncontrolling Interest [Table] Noncontrolling Interest [Line Items] NONCONTROLLING INTERESTS Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] Stockholders' Equity The amount of decrease in noncontrolling interest from accrual of distribution. Minority Interest Decrease from Distributions, Accrual Distributions accrual Decrease in redeemable noncontrolling interest balance from cash distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders. Minority Decrease From Cash Distributions To Noncontrolling Interest Holders Distributions to noncontrolling interest holders Redeemable Noncontrolling Interest, by Legal Entity [Table] Temporary Equity [Line Items] Mezzanine Equity - Redeemable Noncontrolling Interest - Ares The amount of increase in temporary equity due to contributions. Temporary Equity, Increase From Contributions Contributions from noncontrolling interest holders, net Decrease in redeemable noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders. Noncontrolling Interest, Decrease from Distributions to Redeemable Noncontrolling Interest Holders Distributions to noncontrolling interest holders Schedule of Business Acquisitions, by Acquisition [Table] Acquisitions JOINT VENTURES Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivatives Derivative, Nonmonetary Notional Amount Daily Volume (in Bbl) Derivative, Average Price Risk Option Strike Price Weighted-average price (in dollars per barrel) Hedged amount for variable-rate indebtedness Derivative, Cap Interest Rate Interest rate to be in place to receive payment Offsetting Assets [Table] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Other Current Assets [Member] Other current assets Accrued Liabilities [Member] Accrued liabilities Offsetting Assets [Line Items] Fair Value of Derivatives Derivative Asset, Fair Value, Gross Asset Gross Amounts Recognized at Fair Value Derivative Asset, Fair Value, Gross Liability Gross Amounts Offset in the Balance Sheet Derivative Asset Net Fair Value Presented in the Balance Sheet Derivative Liability, Fair Value, Gross Liability Gross Amounts Recognized at Fair Value Derivative Liability, Fair Value, Gross Asset Gross Amounts Offset in the Balance Sheet Derivative Liability Net Fair Value Presented in the Balance Sheet Derivative Assets (Liabilities), at Fair Value, Net Total derivatives Interest Rate Derivative Assets, at Fair Value Interest rate derivative assets Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments Non-cash derivative loss Basic Earnings Per Share Basic EPS calculation Net Income (Loss) Available to Common Stockholders, Basic Net loss available to common stockholders Weighted Average Number of Shares Outstanding, Basic Weighted-average common shares outstanding - basic Earnings Per Share, Diluted [Abstract] Diluted EPS calculation Net Income (Loss) Available to Common Stockholders, Diluted Net loss available to common stockholders Weighted Average Number of Shares Outstanding, Diluted Weighted-average common shares outstanding - diluted Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Weighted-average anti-dilutive shares Schedule of Defined Benefit Plans Disclosures [Table] Retirement Plan Type [Axis] Retirement Plan Type [Domain] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Pension Plans Defined Benefit [Member] Pension Benefit Other Postretirement Benefit Plans Defined Benefit [Member] Postretirement Benefit Defined Benefit Plan Disclosure [Line Items] Postretirement and Other Benefit Plans Disclosure Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] Net periodic benefit costs: Defined Benefit Plan, Service Cost Service cost Defined Benefit Plan, Interest Cost Interest cost Defined Benefit Plan, Expected Return on Plan Assets Expected return on plan assets Defined Benefit Plan, Actuarial Gain (Loss) Recognized actuarial loss Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements Settlement loss Defined Benefit Plan, Net Periodic Benefit Cost Net periodic benefit costs Defined Benefit Plan, Contributions by Employer Employer contributions to pension plan Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year Expected contribution to defined benefit pension plans during the reminder of 2019 Term of payment following invoicing for contracts with customers, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Term of Payment after Invoicing for Contracts with Customers Typical term of payment following invoicing Disaggregation of Revenue [Table] Disaggregation of Revenue [Line Items] Disaggregation of revenue Interest Income, Other Interest income Lease, Cost [Abstract] Operating lease costs Operating Lease, Cost Operating lease cost Short-term Lease, Cost Variable Lease, Cost Variable lease cost Lease, Cost Total lease cost Cash Flow, Investing Activities, Lessee [Abstract] Investing activities, operating lease liabilities payment Operating Lease, Payments Payment of operating lease liabilities reported in net cash used in investing activities Cash Flow, Operating Activities, Lessee [Abstract] Operating activities, operating lease liabilities payment Operating Lease, Payments, Use Payment of operating lease liabilities reported in net cash provided by operating activities Operating Lease, Liability, Noncurrent Long-term liabilities Operating Lease, Weighted Average Remaining Lease Term Weighted-average remaining lease term (in years) Operating Lease, Weighted Average Discount Rate, Percent Weighted-average discount rate (as a percentage) Operating Lease, Impairment Loss Impairment on right-of-use asset Operating Lease Liabilities, Payments Due [Abstract] Operating lease liabilities Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months 2019 Lessee, Operating Lease, Liability, Payments, Due Year Two 2020 Lessee, Operating Lease, Liability, Payments, Due Year Three 2021 Lessee, Operating Lease, Liability, Payments, Due Year Four 2022 Lessee, Operating Lease, Liability, Payments, Due Year Five 2023 Lessee, Operating Lease, Liability, Payments, Due after Year Five Thereafter Lessee, Operating Lease, Liability, Undiscounted Excess Amount Less: Interest Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Noncancelable operating leases Operating Leases, Future Minimum Payments Due, Next Twelve Months 2019 Operating Leases, Future Minimum Payments, Due in Two Years 2020 Operating Leases, Future Minimum Payments, Due in Three Years 2021 Operating Leases, Future Minimum Payments, Due in Four Years 2022 Operating Leases, Future Minimum Payments, Due in Five Years 2023 Operating Leases, Future Minimum Payments, Due Thereafter Thereafter Operating Leases, Future Minimum Payments Due Total Operating Leases, Rent Expense, Net Rental expense for operating leases Effective Income Tax Rate Reconciliation, Percent Effective tax rate (as a percent) The percentage of working interest sold. Percentage of Working Interest Sold Working interest in Lost Hills field sold (in percent) Disposal Group, Including Discontinued Operation, Consideration Total consideration of the sale of Lost Hills field 50% interest Proceeds from Divestiture of Businesses Consideration in cash in the sale of Lost Hills field 50% interest The number of development plan in a field that is being sold. Oil And Gas, Number Of Development Plan Included In Field Sold Number of well development plan included in the sale of Lost Host field The minimum value of well development plan in a field that is being sold. Oil And Gas Field, Development Plan, Minimum Value Minimum value of well development plan of Lost Hills field Additional Paid In Capital [Member] Additional Paid-in Capital Adjustments for New Accounting Pronouncements [Axis] Type Of Adoption [Member] Type of Adoption [Domain] Accounting Standards Update201602 [Member] ASU 2016-02 Restatement [Axis] Restatement [Domain] Restatement [Domain] Restatement Adjustment [Member] Adoption Adjustment Other Noncurrent Liabilities [Member] Other long-term liabilities Debt Instrument [Axis] Debt Instrument Name [Domain] Debt Instrument, Name [Domain] Secured Debt [Member] 2014 Revolving Credit Facility (Shared First Priority Lien) Represents information pertaining to Secured First Lien Second Out Credit Agreement which is entered into by entity in 2017. Secured First Lien Second Out Credit Agreement2017 [Member] 2017 Credit Agreement (Shared First Priority Lien) Represents information pertaining to Secured First Lien Second Out Credit Agreement which is entered into by entity in 2016. Secured First Lien Second Out Credit Agreement [Member] 2016 Credit Agreement (Shared First Priority Lien) Senior Lien [Member] Second Lien Notes (Second Priority Lien) Senior Notes [Member] Senior Notes (Unsecured) Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] London Interbank Offered Rate L I B O R [Member] Applicable margin on LIBOR loans Represents alternate base rate Debt Instrument Variable Rate Base Rate [Member] Applicable margin on Alternate Base Rate loans Represents the senior notes payable that bear an interest rate of 6.00 percent and will mature in 2024. Senior Notes600 Percent Due2024 [Member] 6% Senior Notes due 2024 Range [Axis] Range [Member] Range [Domain] Minimum [Member] Minimum Maximum [Member] Maximum Scenario [Axis] Scenario Unspecified [Domain] Scenario, Unspecified [Domain] The scenario when 2016 Credit Agreement has $100 million outstanding amount 91 days prior to maturity. Credit Agreement201691 Days Prior To Maturity100 Million Outstanding [Member] 91 days prior to maturity of 2016 Credit Agreement Letter Of Credit [Member] Letters of Credit Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility [Member] 2014 Revolving Credit Facility Type of Arrangement and Non-arrangement Transactions [Axis] Arrangements And Nonarrangement Transactions [Member] Arrangements and Non-arrangement Transactions [Domain] Represents Ares joint venture (Ares JV). Ares Joint Venture [Member] Ares JV Represents Benefit Street Partners (BSP). Benefit Street Partners [Member] BSP JV Class of Stock [Axis] Class Of Stock [Domain] Class of Stock [Domain] This element represents mezzanine equity redeemable noncontrolling interest. Mezzanine Equity Redeemable Noncontrolling Interest [Member] Mezzanine Equity - Redeemable Noncontrolling Interest - Ares Legal Entity [Axis] Entity [Domain] Entity [Domain] Business Acquisition [Axis] Business Acquisition Acquiree [Domain] Business Acquisition, Acquiree [Domain] Represents the information pertaining to joint venture with benefit street partners of divestitures and other. Joint Venture With Benefit Street Partners [Member] Joint venture with BSP Derivative Instrument [Axis] Derivative Contract Type [Domain] Derivative Contract [Domain] Call Option [Member] Calls Put Option [Member] Puts Position [Axis] Position [Domain] Position [Domain] Long [Member] Purchased Short [Member] Sold Information about the production period subject to hedge instruments. Hedge Production Periods [Axis] Identified production period subject to hedge instruments. Hedge Production Periods [Domain] Hedge Production Periods [Domain] Represents the entity's production during the second quarter of 2019. Second Quarter Production2019 [Member] Q2 2019 Represents the entity's production during the third quarter of 2019. Third Quarter Production2019 [Member] Q3 2019 Represents the entity's production during the fourth quarter of 2019. Fourth Quarter Production2019 [Member] Q4 2019 Represents the entity's production during the first quarter of 2020. First Quarter Production2020 [Member] Q1 2020 Interest Rate Cap [Member] Interest-rate contract Represents one month LIBOR. One Month Libor [Member] One month LIBOR Measurement Basis [Axis] Portion At Fair Value Fair Value Disclosure [Member] Portion at Fair Value Measurement [Member] Carrying Reported Amount Fair Value Disclosure [Member] Presented in the Balance Sheet Estimate Of Fair Value Fair Value Disclosure [Member] Recognized Fair Value Commodity Contract [Member] Commodity Contracts Interest Rate Contract [Member] Interest Rate Contracts Other Assets [Member] Other assets Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Other Nonoperating Income Expense [Member] Other non-operating expense Products and Services [Axis] Products And Services [Domain] Products and Services [Domain] Oil And Condensate [Member] Oil Public Utilities Inventory Propane [Member] NGLs Natural Gas Production [Member] Natural gas This member represents electricity sales. Sale Of Electricity [Member] Electricity This member represents marketing trading income. Trading Income From Marketing [Member] Marketing, trading and other It represents Interest income. Interest [Member] Interest income