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Summary of Significant Accounting Policies - Revenue Recognition (Details) t in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) t | Jun. 30, 2021 USD ($)
Concentration Risk [Line Items] |  |  |  |
Percent of total production transferred for title and marketing |  |  | 10.00% |
Maximum total production transferred for title and marketing (in tons) | t |  |  | 250 |
Other revenues | $ 625,156 | $ 227,440 | $ 1,003,808 | $ 441,204
XCoal | Customer Concentration Risk | Revenue |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Other revenues | $ 128,000 | $ 141,800 | $ 211,500 | $ 248,100
Concentration risk, percentage | 20.30% | 63.10% | 20.80% | 57.30%

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