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v3.22.4

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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