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Fair Value Measurements (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Document Period End Date | Mar. 31, 2020 |
Proved Oil and Gas Properties, Other Property, Plant and Equipment and Other Assets [Abstract] |  |
Proved Oil and Gas Properties and Other Assets Carrying Amount | $ 1,813,000 |
Proved Oil and Gas Properties and Other Assets Written Down During the Period - Fair value at End of Period | 357,000 |
Pretax Impairment Charges for Proved Oil and Gas Properties, Other Property, Plant and Equipment and Other Assets | 1,456,000 |
Debt Disclosure [Abstract] |  |
Aggregate Principal Amount of Current and Long-Term Debt | 5,140,000 |
Estimated Fair Value of Debt | 5,145,000 | $ 5,452,000
Commodity Contract [Member] | Crude Oil | Price Swaps |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | 898,090 |
Financial Liabilities: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | 23,266
Commodity Contract [Member] | Crude Oil | Price Swaps | Fair Value, Inputs, Level 1 [Member] |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | 0 |
Financial Liabilities: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | 0
Commodity Contract [Member] | Crude Oil | Price Swaps | Fair Value, Inputs, Level 2 [Member] |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | 898,090 |
Financial Liabilities: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | 23,266
Commodity Contract [Member] | Crude Oil | Price Swaps | Fair Value, Inputs, Level 3 [Member] |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | 0 |
Financial Liabilities: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | 0
Commodity Contract [Member] | Crude Oil | Basis Swaps |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | 888 |
Financial Liabilities: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 93 |
Commodity Contract [Member] | Crude Oil | Basis Swaps | Fair Value, Inputs, Level 1 [Member] |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | 0 |
Financial Liabilities: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 0 |
Commodity Contract [Member] | Crude Oil | Basis Swaps | Fair Value, Inputs, Level 2 [Member] |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | 888 |
Financial Liabilities: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 93 |
Commodity Contract [Member] | Crude Oil | Basis Swaps | Fair Value, Inputs, Level 3 [Member] |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | 0 |
Financial Liabilities: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 0 |
Commodity Contract [Member] | Crude Oil | Roll Differential Swap |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | 7,255 |
Commodity Contract [Member] | Crude Oil | Roll Differential Swap | Fair Value, Inputs, Level 1 [Member] |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | 0 |
Commodity Contract [Member] | Crude Oil | Roll Differential Swap | Fair Value, Inputs, Level 2 [Member] |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | 7,255 |
Commodity Contract [Member] | Crude Oil | Roll Differential Swap | Fair Value, Inputs, Level 3 [Member] |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | 0 |
Commodity Contract [Member] | Natural Gas | Collars |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | 3,678 |
Commodity Contract [Member] | Natural Gas | Collars | Fair Value, Inputs, Level 1 [Member] |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | 0 |
Commodity Contract [Member] | Natural Gas | Collars | Fair Value, Inputs, Level 2 [Member] |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | 3,678 |
Commodity Contract [Member] | Natural Gas | Collars | Fair Value, Inputs, Level 3 [Member] |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | 0 |
Commodity Contract [Member] | Natural Gas | Basis Swaps |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure |  | 970
Financial Liabilities: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 7,712 |
Commodity Contract [Member] | Natural Gas | Basis Swaps | Fair Value, Inputs, Level 1 [Member] |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure |  | 0
Financial Liabilities: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 0 |
Commodity Contract [Member] | Natural Gas | Basis Swaps | Fair Value, Inputs, Level 2 [Member] |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure |  | 970
Financial Liabilities: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 7,712 |
Commodity Contract [Member] | Natural Gas | Basis Swaps | Fair Value, Inputs, Level 3 [Member] |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure |  | 0
Financial Liabilities: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 0 |
Commodity Contract [Member] | Natural Gas Liquids | Price Swaps |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | 30,822 | 3,401
Commodity Contract [Member] | Natural Gas Liquids | Price Swaps | Fair Value, Inputs, Level 1 [Member] |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | 0 | 0
Commodity Contract [Member] | Natural Gas Liquids | Price Swaps | Fair Value, Inputs, Level 2 [Member] |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | 30,822 | 3,401
Commodity Contract [Member] | Natural Gas Liquids | Price Swaps | Fair Value, Inputs, Level 3 [Member] |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | 0 | 0
Assets From Price Risk Management Activities |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | $ 933,000 | 1,000
Liabilities From Price Risk Management Activities [Member] |  |
Financial Liabilities: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | $ 20,000

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