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Unconsolidated Subsidiaries (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated subsidiaries	$ 14,927	$ 19,090
Income Statement [Abstract]
Revenues	241,719	191,846
Gross profit	67,842	43,452
Income before income taxes	87,723	56,850
Net income	74,158	48,125
Balance Sheet
Current assets	260,407	203,053
Current liabilities	44,270	46,016
NACoal | Unconsolidated mines
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated subsidiaries	14,900	19,100
Balance Sheet
Dividends from unconsolidated mines	49,000	51,700
NACoal | Unconsolidated mines
Schedule of Equity Method Investments [Line Items]
Maximum risk of loss	7,100	7,600
NACoal | Variable Interest Entity, Not Primary Beneficiary | Unconsolidated mines
Income Statement [Abstract]
Revenues	664,824	764,759
Gross profit	47,748	68,076
Income before income taxes	57,250	60,865
Net income	48,467	53,248
Balance Sheet
Current assets	214,098	168,669
Non-current assets	805,833	900,924
Current liabilities	116,701	98,887
Non-current liabilities	$ 896,134	$ 963,128

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