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Fair Value Measurements (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Proved Oil and Gas Properties, Other Property, Plant and Equipment and Other Assets [Abstract] |  |
Proved Oil and Gas Properties and Other Assets Carrying Amount | $ 413,000 |
Proved Oil and Gas Properties and Other Assets Written Down During the Period - Fair value at End of Period | 322,000 |
Pretax Impairment Charges for Proved Oil and Gas Properties and Other Assets | 91,000 |
Pretax Impairment Charge for a Commodity Price-Related Write-Down of Other Assets | 89,000 |
Debt Disclosure [Abstract] |  |
Aggregate Principal Amount of Current and Long-Term Debt | 5,140,000 | $ 6,040,000
Estimated Fair Value of Debt | 5,387,000 | 6,027,000
Commodity Contract [Member] | Crude Oil | Price Swaps |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | 118,854 |
Commodity Contract [Member] | Crude Oil | Price Swaps | Fair Value, Inputs, Level 1 [Member] |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | 0 |
Commodity Contract [Member] | Crude Oil | Price Swaps | Fair Value, Inputs, Level 2 [Member] |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | 118,854 |
Commodity Contract [Member] | Crude Oil | Price Swaps | Fair Value, Inputs, Level 3 [Member] |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | 0 |
Commodity Contract [Member] | Crude Oil | Basis Swaps |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | 867 |
Financial Liabilities: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 3,277 | 23,806
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 | 0
Commodity Contract [Member] | Crude Oil | Basis Swaps | Fair Value, Inputs, Level 2 [Member] |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | 867 |
Financial Liabilities: |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 3,277 | 23,806
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 | $ 0
Commodity Contract [Member] | Natural Gas | Price Swaps |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | 18,507 |
Commodity Contract [Member] | Natural Gas | Price Swaps | Fair Value, Inputs, Level 1 [Member] |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | 0 |
Commodity Contract [Member] | Natural Gas | Price Swaps | Fair Value, Inputs, Level 2 [Member] |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | 18,507 |
Commodity Contract [Member] | Natural Gas | Price Swaps | Fair Value, Inputs, Level 3 [Member] |  |
Financial Assets: [Abstract] |  |
Assets, Fair Value Disclosure | $ 0 |

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