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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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