Accounting Policies [Abstract] Nature Of Operations And Summary Of Significant Accounting Policies Significant Accounting Policies [Text Block] Fair value measurements [Abstract] Fair value measurements [Abstract] Asset Retirement Obligation Disclosure [Abstract] Asset Retirement Obligations Asset Retirement Obligation Disclosure [Text Block] Debt Disclosure [Abstract] Long-Term Debt Long-term Debt [Text Block] Statement [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Common Class A [Member] Common Class A [Member] Common Class B [Member] Common Class B [Member] Common Class C [Member] Common Class C [Member] Common Class D [Member] Common Class D [Member] Common Class D [Member] Common Class E [Member] Common Class E [Member] Common Class E [Member] Common Class F [Member] Common Class F [Member] Common Class F [Member] Common Class G [Member] Common Class G [Member] Common Class G [Member] Statement [Line Items] Statement [Line Items] Assets Assets [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Accounts receivable, net Accounts and Other Receivables, Net, Current Inventories Inventory, Net Prepaid expenses Prepaid Expense, Current Derivative instruments Derivative Assets, Current Total current assets Assets, Current Property and equipment—at cost, net Property, Plant and Equipment, Net Oil and natural gas properties, using the full cost method: Oil And Natural Gas Properties, Using The Full Cost Method [Abstract] Oil And Natural Gas Properties, Using The Full Cost Method [Abstract] Proved Capitalized Costs, Proved Properties Unevaluated (excluded from the amortization base) Capitalized Costs, Unproved Properties Accumulated depreciation, depletion, amortization and impairment Capitalized Costs, Accumulated Depreciation, Depletion, Amortization and Valuation Allowance Relating to Oil and Gas Producing Activities Total oil and natural gas properties Capitalized Costs, Oil and Gas Producing Activities, Net Derivative instruments Derivative Assets, Noncurrent Deferred income taxes Deferred Tax Assets, Net, Noncurrent Other assets Other Assets, Noncurrent Total assets Assets Liabilities and stockholders' equity Liabilities and Equity [Abstract] Accounts payable and accrued liabilities Accounts Payable and Other Accrued Liabilities, Current Accrued payroll and benefits payable Employee-related Liabilities, Current Accrued interest payable Interest Payable, Current Revenue distribution payable Accounts Payable, Other, Current Current maturities of long-term debt and capital leases Long-term Debt and Capital Lease Obligations, Current Derivative instruments Derivative Liabilities, Current Deferred income taxes Deferred Tax Liabilities, Current Total current liabilities Liabilities, Current Long-term debt and capital leases, less current maturities Long-term Debt, Excluding Current Maturities Derivative instruments Derivative Liabilities, Noncurrent Stock-based compensation Deferred Compensation Liability, Classified, Noncurrent Asset retirement obligations Asset Retirement Obligations, Noncurrent Commitments and contingencies (Note 10) Commitments and Contingencies Stockholders' equity: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Preferred stock, 600,000 shares authorized, none issued and outstanding Preferred Stock, Value, Issued Common stock Common Stock, Value, Issued Additional paid in capital Additional Paid in Capital, Common Stock Accumulated deficit Retained Earnings (Accumulated Deficit) Accumulated other comprehensive income, net of taxes Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax Total stockholders' equity Stockholders' Equity Attributable to Parent Total liabilities and stockholders' equity Liabilities and Equity Commitments and Contingencies Disclosure [Abstract] Commitments And Contingencies Commitments and Contingencies Disclosure [Text Block] Statement of Cash Flows [Abstract] Cash and Cash Equivalents, Period Increase (Decrease) [Abstract] Cash and Cash Equivalents, Period Increase (Decrease) [Abstract] Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Net income (loss) Net Income (Loss) Attributable to Parent Adjustments to reconcile net income (loss) to net cash provided by operating activities Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation, depletion and amortization Depreciation, Depletion and Amortization Deferred income taxes Deferred Income Tax Expense (Benefit) Reclassification adjustment for hedge (gains) losses included in net income (loss) Cash Flow Hedge Gain (Loss) Reclassified to Revenue, Net Non-hedge derivative losses Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Loss on extinguishment of debt Gains (Losses) on Extinguishment of Debt Loss on sale of assets Gain (Loss) on Disposition of Property Other Other Noncash Income (Expense) Change in assets and liabilities Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts and Other Receivables Inventories Increase (Decrease) in Inventories Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Accounts payable and accrued liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Revenue distribution payable Increase (Decrease) in Other Accounts Payable Stock-based compensation Increase (Decrease) in Deferred Compensation Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Purchase of property and equipment and oil and natural gas properties Payments to Acquire Oil and Gas Property and Equipment Proceeds from dispositions of property and equipment and oil and natural gas properties Proceeds from Sale of Oil and Gas Property and Equipment Settlement of non-hedge derivative instruments Payments for (Proceeds from) Derivative Instrument, Investing Activities Other Payments for (Proceeds from) Other Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from long-term debt Proceeds from Issuance of Secured Debt Repayment of long-term debt and capital lease obligations Repayments of Secured Debt Proceeds from Senior Notes Proceeds from Issuance of Senior Long-term Debt Repayment of Senior Notes Early Repayment of Senior Debt Payment of debt issuance costs and other financing fees Payments of Financing Costs Payment of debt extinguishment costs Payments of Debt Extinguishment Costs Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Net increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Document And Entity Information [Abstract] Document And Entity Information [Abstract] Entities [Table] Entities [Table] Entity Information [Line Items] Entity Information [Line Items] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Fair Value Disclosures [Text Block] Fair Value Disclosures [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Activities And Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Balance Sheeet Parentheticals [Abstract] Balance Sheeet Parentheticals [Abstract] Statement [Table] Preferred stock, shares authorized Preferred Stock, Shares Authorized Preferred stock, shares issued Preferred Stock, Shares Issued Preferred stock, shares outstanding Preferred Stock, Shares Outstanding Common stock, par value Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Common stock, shares outstanding Common Stock, Shares, Outstanding Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Supplemental Cash Flow Elements [Abstract] Supplemental Disclosures to the Consolidated Statements of Cash Flows Cash Flow, Supplemental Disclosures [Text Block] Stockholders' Equity Note [Abstract] Common Stock Common Stock [Text Block] Common Stock [Text Block] Income Statement [Abstract] Revenues: Revenues [Abstract] Oil and natural gas sales Oil and Gas Sales Revenue Gain (loss) from oil hedging activities Other revenues Other Revenue, Net Total revenues Revenues Costs and expenses: Costs and Expenses [Abstract] Lease operating Oil and Gas Property, Lease Operating Expense Production tax Taxes, Other General and administrative General and Administrative Expense Other expenses Other Cost and Expense, Operating Total costs and expenses Costs and Expenses Operating income Operating Income (Loss) Non-operating expense: Nonoperating Income (Expense) [Abstract] Interest expense Interest Expense Non-hedge derivative losses Loss on extinguishment of debt Financing costs Financing Costs Costs associated with unsuccessful debt offerings or equity transactions. Other income and expenses Other Nonoperating Income (Expense) Net non-operating expense Nonoperating Income (Expense) Income (loss) before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income tax expense (benefit) Income Tax Expense (Benefit) Net income (loss) Consolidated Statements of Comprehensive Income [Abstract] Consolidated Statements of Comprehensive Income [Abstract] Statement, Scenario [Axis] Statement, Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Net Income (Loss) Attributable to Parent [Abstract] Net Income (Loss) Attributable to Parent [Abstract] Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax [Abstract] Reclassification adjustment for hedge (gains) losses included in net income (loss) Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, before Tax Income tax expense (benefit) related to other comprehensive income (loss) Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Tax Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Related Party Transactions [Abstract] Related Party Transactions Related Party Transactions Disclosure [Text Block]