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Attributable to Nonredeemable Noncontrolling Interest Assets held for sale Disposal Group, Including Discontinued Operation, Assets, Current Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] 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. Title of 12(b) Security Title of 12(b) Security Statement [Table] Statement [Table] Other current assets Other current assets Other Assets, Current Hedge Production Periods [Axis] Hedge Production Periods [Axis] Information about the production period subject to hedge instruments. Debt Repurchases of debt Long-term Debt, Unclassified [Abstract] Unrecognized compensation expense Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Statistical Measurement [Axis] Statistical Measurement [Axis] Gross Amounts at Fair Value Derivative Liability, Fair Value, Gross Liability Distributions to noncontrolling interest holders Temporary Equity, Decrease From Distributions To Redeemable Noncontrolling Interest Holders Temporary Equity, Decrease From Distributions To Redeemable Noncontrolling Interest Holders Subsequent Event Subsequent Event [Member] Net (payments) proceeds from settled commodity derivatives Proceeds (Payments) on Derivative Settlements to Reconcile Net Income Loss to Cash provided by Used in Operating Activities 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. Cover [Abstract] Cover [Abstract] Equity attributable to noncontrolling interests Stockholders' Equity Attributable to Noncontrolling Interest Other non-operating expenses Other Nonoperating Expense Pension Benefit Pension Plan [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Schedule of derivative instruments in statement of financial position, fair value Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Prepaid power plant maintenance Prepaid Expense, Noncurrent Other, net Other Expenses DEBT Long-term Debt [Text Block] Adjustments to reconcile net loss to net cash provided by (used in) operating activities: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]