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Principles of Consolidation and Nature of Operations (Narrative) (Details) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 02, 2022 USD ($) | Sep. 30, 2021 USD ($) | Dec. 31, 2022 USD ($) a | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) a segment | Dec. 31, 2021 USD ($) a
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |
Number of operating segments | segment |  |  |  |  |  | 3 |
Other contract termination settlements |  |  |  |  |  | $ 14,000 | $ 10,333
Income from equity method investee |  |  |  |  |  | 2,194 | 0
Proceeds from the sale of private company equity units |  |  |  |  |  | 18,628 | 0
Acquisition of mineral and royalty interest |  |  |  |  |  | $ 11,924 | $ 5,331
Gross acreage | a |  |  | 13,600 |  |  | 13,600 | 20,600
Net acreage | a |  |  | 880 |  |  | 880 | 1,800
Mineral and Royalty Interest |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |
Gross acreage | a |  |  | 141,400 |  |  | 141,400 |
Net acreage | a |  |  | 60,800 |  |  | 60,800 |
Private Equity Funds |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |
Income from equity method investee |  |  |  | $ 2,200 |  |  |
HLCP |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |
Proceeds from the sale of private company equity units |  |  | $ 18,600 |  |  |  |
Loss on disposal of equity method investment |  |  | 1,300 |  |  |  |
HLCP | Minimum |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |
Earn-out payments |  |  | 0 |  |  | $ 0 |
HLCP | Maximum |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |
Earn-out payments |  |  | $ 13,600 |  |  | $ 13,600 |
Coal Mining customer | Falkirk |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |
Total gain on contract termination |  |  |  |  | $ 30,900 |  |
Other contract termination settlements | $ 14,000 |  |  |  |  |  |
Fair value gained from contract termination | 4,100 |  |  |  |  |  |
Fair value of equity securities without readily determinable fair value, gained as a result of terminated contract | 12,800 |  |  |  |  |  |
Investment | $ 5,000 |  |  |  |  |  |
Coal Mining customer | Bisti |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |
Other contract termination settlements |  | $ 10,300 |  |  |  |  |

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