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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021 | Jan. 03, 2018
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  | $ 323,314 |  | $ 323,314 |  | $ 323,314 |
Accumulated impairment losses on goodwill |  | 473,045 |  | $ 473,045 |  | $ 473,045 |
Useful life, customer relationship intangible assets |  |  |  | 17 years |  |  |
Amortization expense |  | 1,638 | $ 1,638 | $ 3,277 | $ 3,276 |  |
Estimated annual amortization expense, Year 2022 |  | 6,552 |  | 6,552 |  |  |
Estimated annual amortization expense, Year 2023 |  | 6,552 |  | 6,552 |  |  |
Estimated annual amortization expense, Year 2024 |  | 6,552 |  | 6,552 |  |  |
Estimated annual amortization expense, Year 2025 |  | 6,552 |  | 6,552 |  |  |
Estimated annual amortization expense, Year 2026 |  | $ 6,552 |  | $ 6,552 |  |  |
Midstream Acquisition |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Cash consideration transferred | $ 305,000 |  |  |  |  |  |
Fair value of previously held equity interest | $ 799,033 |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 796,359
Other intangible assets |  |  |  |  |  |  | $ 128,781
CNX Gathering LLC |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Ownership percentage in equity method investment | 50.00% |  |  |  |  |  |

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