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v3.22.2.2

Nature of Operations and Basis of Presentation (Narrative) (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
May 02, 2022 USD ($) | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) segment | Sep. 30, 2021 USD ($)
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |
Number of operating segments | segment |  |  |  |  | 3 |
Gain on contract termination |  | $ 0 |  | $ 10,333 | $ 14,000 | $ 10,333
Expenditures for property, plant and equipment and acquisition of mineral interests |  | 17,086 |  | $ 19,407 | 42,004 | $ 35,534
Coal Mining | Falkirk |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |
Total gain on contract termination |  |  | $ 30,900 |  |  |
Gain on contract termination | $ 14,000 |  |  |  |  |
Fair value gained from contract termination | 4,100 |  |  |  |  |
Fair value of privately-held company | 12,800 |  |  |  |  |
Investment | $ 5,000 |  |  |  |  |
Minerals Management | Texas Portion, Permian Basin and Wyoming Portion, Powder River |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |
Expenditures for property, plant and equipment and acquisition of mineral interests |  |  |  |  | $ 12,300 |
Payments to acquire royalty interests |  | $ 11,400 |  |  |  |

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