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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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