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Contingencies and Commitments (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 05, 2014 | Jun. 30, 2020 | Aug. 09, 2018 | Dec. 31, 2020
Gathering, Processing and Transportation Agreement |  |  |  |
Other Commitments [Line Items] |  |  |  |
Damages sought, value |  | $ 838,000 |  |
Other Commitment, Fiscal Year Maturity [Abstract] |  |  |  |
2021 |  |  |  | $ 865,000
2022 |  |  |  | 729,000
2023 |  |  |  | 596,000
2024 |  |  |  | 521,000
2025 |  |  |  | 471,000
2026 – 2034 |  |  |  | 1,911,000
Total |  |  |  | 5,093,000
Service Contract |  |  |  |
Other Commitment, Fiscal Year Maturity [Abstract] |  |  |  |
2021 |  |  |  | 7,000
2022 |  |  |  | 2,000
Total |  |  |  | 9,000
Commonwealth of Pennsylvania, Royalty Underpayment | Settled Litigation |  |  |  |
Other Commitments [Line Items] |  |  |  |
Settlement amount |  |  | $ 36,000 |
Healthcare of Ontario Pension Plan (HOOPP) | Pending litigation | Chaparral Energy, Inc. |  |  |  |
Other Commitments [Line Items] |  |  |  |
Damages sought, value | $ 215,000 |  |  |
Pennsylvania Department of Environmental Protection | Pending litigation | Minimum |  |  |  |
Other Commitments [Line Items] |  |  |  |
Damages sought, value |  |  |  | $ 300

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