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Unconsolidated Subsidiaries (Condensed Financial Statements) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Statement of Operations
Revenues	$ 237,708	$ 214,794
Gross profit	29,756	14,591
Income before income taxes	33,646	(64,158)
Net income	33,741	(39,587)
Balance Sheet
Current assets	264,738	231,998
Current liabilities	64,888	69,986
NACoal | Variable Interest Entity, Not Primary Beneficiary | Unconsolidated Mines
Statement of Operations
Revenues	542,643	610,734
Gross profit	60,256	63,646
Income before income taxes	56,831	49,994
Net income	49,284	43,714
Balance Sheet
Current assets	145,655	124,387
Non-current assets	816,430	814,226
Current liabilities	158,591	161,606
Non-current liabilities	$ 798,043	$ 772,003

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