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v3.22.2

Nature of Operations and Basis of Presentation (Narrative) (Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
May 02, 2022 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) operatingSegment | Jun. 30, 2021 USD ($)
Long-term Purchase Commitment [Line Items] |  |  |  |  |
Number of operating segments | operatingSegment |  |  |  | 3 |
Gain on contract termination |  | $ 14,000 | $ 0 | $ 14,000 | $ 0
Expenditures for property, plant and equipment and acquisition of mineral interests |  | 20,269 | $ 11,251 | 24,918 | $ 16,127
Coal Mining |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |
Fair value gained from contract termination | $ 4,100 |  |  |  |
Coal Mining | Falkirk |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |
Total gain on contract termination |  | $ 30,900 |  |  |
Gain on contract termination | 14,000 |  |  |  |
Fair value of privately-held company | 12,800 |  |  |  |
Investment | $ 5,000 |  |  |  |
Minerals Management | New Mexico Portion, Permian Basin |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |
Expenditures for property, plant and equipment and acquisition of mineral interests |  |  |  | $ 1,000 |

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