Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Document Type Document Type COSTS Costs and Other Deductions [Abstract] No definition available LAWSUITS, CLAIMS, COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Percentage of common acquired Plan Of Reorganization, Settlement Agreement, Percentage Of Common Stock In Exchange For Debt Plan Of Reorganization, Settlement Agreement, Percentage Of Common Stock In Exchange For Debt PENSION AND POSTRETIREMENT BENEFIT PLANS Retirement Benefits [Text Block] Operating costs Production Costs, Period Cost Other current assets Other Current Assets [Member] Q2 2021 Second Quarter Production2021 [Member] Second Quarter Production2021 [Member] Net Fair Value Derivative Asset January - October 2023 Production2023 [Member] Production2023 Statistical Measurement [Domain] Statistical Measurement [Domain] Second Lien Notes Senior Lien [Member] Line of Credit Line of Credit [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] DERIVATIVES Derivative Instruments and Hedging Activities Disclosure [Text Block] Proceeds from issuance of debt Proceeds from Issuance of Debt Security Exchange Name Security Exchange Name Calls Call Option [Member] OPERATING LOSS Operating Income (Loss) Total current liabilities Liabilities, Current Variable Rate [Domain] Variable Rate [Domain] Variable Rate [Axis] Variable Rate [Axis] EHP Notes EHP Notes [Member] EHP Notes Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Award vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Entity Address, State or Province Entity Address, State or Province Amounts due to counterparties on derivative contracts Due to Related Parties, Current Accounts payable Accounts Payable, Current Numerator for Basic and Diluted Earnings per Share Earnings Per Share Reconciliation [Abstract] Amounts due from counterparties on derivative contracts Derivative Asset, Current Accumulated deficit Retained Earnings (Accumulated Deficit) Operating Operating Lease, Right-of-Use Asset Repayments of lines of credit Repayments of Lines of Credit Offsetting Assets [Table] Offsetting Assets [Table] Net (loss) gain on early extinguishment of debt Net loss (gain) on early extinguishment of debt Loss on extinguishment of debt Pre-tax gain on extinguishment of debt, net of a reduction in deferred issuance costs Gain (Loss) on Extinguishment of Debt Benefit Street Partners Benefit Street Partners [Member] Represents Benefit Street Partners (BSP). 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Accrued liabilities Accrued Liabilities [Member] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Trade receivables Accounts Receivable, after Allowance for Credit Loss, Current Finished goods Inventory, Finished Goods, Gross Percentage of common interest held by CRC Noncontrolling Interest, Ownership Percentage by Parent Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Prior to February 1, 2023 Debt Instrument, Redemption, Period Two [Member] Materials and supplies Other Inventory, Supplies, Gross Restructuring Type [Axis] Restructuring Type [Axis] Cash Cash Document Transition Report Document Transition Report Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Axis] Derivative Instrument, Period [Domain] Derivative Instrument, Period [Domain] Derivative Instrument, Period Lien Notes Lien Notes [Member] Lien Notes Gross Amounts at Fair Value Derivative Asset, Fair Value, Gross Asset NON-OPERATING (LOSS) INCOME Nonoperating Income (Expense) [Abstract] Aggregate principal amount issued Debt Instrument, Face Amount Other current assets Other Assets Current Abstract No definition required Contributions from noncontrolling interest holders Temporary Equity, Increase From Contributions The amount of increase in temporary equity due to contributions. 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Common stock (200 shares authorized at $0.01 par value) outstanding shares (83.3 at March 31, 2021 and December 31, 2020) Common Stock, Value, Issued Document Fiscal Year Focus Document Fiscal Year Focus Fair Value of Derivatives Offsetting Assets [Line Items] Proved oil and natural gas properties Impairment Of Oil And Gas Properties, Proved Properties Impairment Of Oil And Gas Properties, Proved Properties Income tax benefit related to stock-based compensation Share-based Payment Arrangement, Expense, Tax Benefit Entity Current Reporting Status Entity Current Reporting Status Position [Axis] Position [Axis] Second Lien Term Loan, EHP Notes, And Revolving Credit Facility Second Lien Term Loan, EHP Notes, And Revolving Credit Facility [Member] Second Lien Term Loan, EHP Notes, And Revolving Credit Facility Retirement Benefits [Abstract] Retirement Benefits [Abstract] Subsequent Event [Table] Subsequent Event [Table] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Equity attributable to noncontrolling interests Stockholders' Equity Attributable to Noncontrolling Interest Granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] Vesting percentage Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage CASH FLOW FROM INVESTING ACTIVITIES Net Cash Provided by (Used in) Investing Activities [Abstract] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] LONG-TERM DEBT, NET Long-term Debt, Excluding Current Maturities Netting Derivative Asset, Fair Value, Gross Liability Debt instrument Debt Debt Instrument [Line Items] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Total equity attributable to common stock Stockholders' Equity Attributable to Parent TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity Performance Stock Units Performance Stock Units [Member] Performance Stock Units Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax INCOME TAXES Income Tax Disclosure [Text Block] Total derivatives Derivative Assets (Liabilities), at Fair Value, Net Entity Address, City or Town Entity Address, City or Town Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Accrued employee-related costs Employee-related Liabilities, Current Total costs Costs and Other Deductions Total costs of sales, operating expenses, and other operating expenses for the period. 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Common Class A Common Class A [Member] Other revenue Product and Service, Other [Member] Increase in cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Stockholders' equity Noncontrolling Interest in Net Income (Loss) Joint Venture Partners, Nonredeemable Finance Finance Lease, Right-of-Use Asset, after Accumulated Amortization Derivative, amount of hedged item Derivative, Amount of Hedged Item OTHER INFORMATION Other Information [Text Block] Other Information Reorganization items Debtor Reorganization Items, Other Expense (Income) Weighted-average common shares outstanding — basic (in shares) Weighted Average Number of Shares Outstanding, Basic Interest rate added to variable rate basis Debt Instrument, Basis Spread on Variable Rate Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Subsequent Events [Abstract] Subsequent Events [Abstract] Payments of cash-based portion of awards Share-based Payment Arrangement, Cash Used to Settle Award Ownership [Axis] Ownership [Axis] Increase (Decrease) in Temporary Equity [Roll Forward] Increase (Decrease) in Temporary Equity [Roll Forward] Ownership [Domain] Ownership [Domain] Net Fair Value Reported Value Measurement [Member] REVENUE RECOGNITION Revenue from Contract with Customer [Text Block] Interest paid, net of capitalized amounts Interest Paid, Excluding Capitalized Interest, Operating Activities Total stockholders' equity Beginning balance Ending balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Fair Value of Long-Term Debt Long-term Debt, Fair Value Total revenues Revenues Class of Stock [Axis] Class of Stock [Axis] Schedule of oil hedge positions Schedule of Derivative Instruments [Table Text Block] Income tax Income Tax Expense (Benefit) Weighted-average price (in dollars per barrel) Derivative, Average Price Risk Option Strike Price Cash—beginning of period Cash—end of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Accrued liabilities Accrued liabilities Accrued Liabilities, Current Diluted (in dollars per share) Earnings Per Share, Diluted Finance Finance Lease, Liability, Current Local Phone Number Local Phone Number Entity Bankruptcy Proceedings, Reporting Current Entity Bankruptcy Proceedings, Reporting Current Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] ECR Ecr Corporate Holdings [Member] This member represents ECR corporate holdings Lease liability Lease Liability Non Current Lease Liability Non Current Derivative, hedging percent Derivative, Terms, Hedging Percent Derivative, Terms, Hedging Percent Principal Amount Long-term Debt, Gross Schedule of long-term debt Schedule of Long-term Debt Instruments [Table Text Block] Entity Address, Address Line One Entity Address, Address Line One Entity Emerging Growth Company Entity Emerging Growth Company Twelve Months Beginning February 1, 2024 Debt Instrument, Redemption, Period Four [Member] Gross Amounts at Fair Value Derivative Liability, Fair Value, Gross Liability Line of credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Award Type [Axis] Award Type [Axis] Weighted-Average Grant-Date Fair Value Weighted-Average Grant-Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Net (loss) income Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest Distributions to noncontrolling interest holders Noncontrolling Interest, Decrease from Distributions to Redeemable Noncontrolling Interest Holders 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. Maximum Maximum [Member] Preferred stock, authorized shares (in shares) Preferred Stock, Shares Authorized Equity Attributable to Noncontrolling Interests Noncontrolling Interest [Member] Accumulated Deficit Retained Earnings [Member] Hedge Production Periods [Axis] Hedge Production Periods [Axis] Information about the production period subject to hedge instruments. 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Other non-operating expenses Other Nonoperating Expense Debt Repurchases of debt Long-term Debt, Unclassified [Abstract] Postretirement Benefit Other Postretirement Benefits Plan [Member] Trading Symbol Trading Symbol Pension Benefit Pension Plan [Member] EARNINGS PER SHARE Earnings Per Share [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Beginning balance Ending balance Redeemable Noncontrolling Interest, Equity, Carrying Amount CURRENT LIABILITIES Liabilities, Current [Abstract] Entity Shell Company Entity Shell Company ASSET IMPAIRMENTS Asset Impairment Charges [Text Block] Proceeds from lines of credit Proceeds from Lines of Credit Statement of Financial Position [Abstract] Statement of Financial Position [Abstract]