Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets, Net [Abstract]
Net Balance	$ 6,006	$ 6,006	$ 28,055
Amortization of intangible assets		2,998	3,719
Long-lived asset impairment charge	65,900	65,887	3,939
Coal supply agreement
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	84,200	84,200	84,200
Accumulated Amortization and Impairment	(78,194)	(78,194)	(56,145)
Net Balance	$ 6,006	$ 6,006	$ 28,055