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Financial Instruments and Risk Management (Carrying Value of Assets and Liabilities Recorded at Fair Value on Recurring Basis) (Details) - Fair Value - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Assets: |  |
Assets | $ 0 | $ 4,280
Liabilities: |  |
Liabilities | 647,555 | 472,528
Commodity collars |  |
Assets: |  |
Derivative assets | 0 | 4,280
Liabilities: |  |
Derivative liability | 146,780 | 19,533
Commodity swaps |  |
Liabilities: |  |
Derivative liability | 239,382 | 239,882
Contingent consideration |  |
Liabilities: |  |
Contingent consideration | 244,226 | 196,151
Nonqualified employee savings plan |  |
Liabilities: |  |
Nonqualified employee savings plan | 17,167 | 16,962
Level 1 |  |
Assets: |  |
Assets | 0 | 0
Liabilities: |  |
Liabilities | 17,167 | 16,962
Level 1 | Commodity collars |  |
Assets: |  |
Derivative assets | 0 | 0
Liabilities: |  |
Derivative liability | 0 | 0
Level 1 | Commodity swaps |  |
Liabilities: |  |
Derivative liability | 0 | 0
Level 1 | Contingent consideration |  |
Liabilities: |  |
Contingent consideration | 0 | 0
Level 1 | Nonqualified employee savings plan |  |
Liabilities: |  |
Nonqualified employee savings plan | 17,167 | 16,962
Level 2 |  |
Assets: |  |
Assets | 0 | 4,280
Liabilities: |  |
Liabilities | 386,162 | 259,415
Level 2 | Commodity collars |  |
Assets: |  |
Derivative assets | 0 | 4,280
Liabilities: |  |
Derivative liability | 146,780 | 19,533
Level 2 | Commodity swaps |  |
Liabilities: |  |
Derivative liability | 239,382 | 239,882
Level 2 | Contingent consideration |  |
Liabilities: |  |
Contingent consideration | 0 | 0
Level 2 | Nonqualified employee savings plan |  |
Liabilities: |  |
Nonqualified employee savings plan | 0 | 0
Level 3 |  |
Assets: |  |
Assets | 0 | 0
Liabilities: |  |
Liabilities | 244,226 | 196,151
Level 3 | Commodity collars |  |
Assets: |  |
Derivative assets | 0 | 0
Liabilities: |  |
Derivative liability | 0 | 0
Level 3 | Commodity swaps |  |
Liabilities: |  |
Derivative liability | 0 | 0
Level 3 | Contingent consideration |  |
Liabilities: |  |
Contingent consideration | 244,226 | 196,151
Level 3 | Nonqualified employee savings plan |  |
Liabilities: |  |
Nonqualified employee savings plan | $ 0 | $ 0

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