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v3.24.0.1

Unconsolidated Subsidiaries (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Schedule of Equity Method Investments [Line Items] |  |
Investments in unconsolidated subsidiaries | $ 12,371 | $ 14,927
Income Statement [Abstract] |  |
Revenues | 214,794 | 241,719
Gross profit | 14,591 | 67,842
Income before income taxes | (64,158) | 87,723
Net (loss) income | (39,587) | 74,158
Balance Sheet |  |
Current assets | 231,998 | 260,407
Current liabilities | 69,986 | 44,270
NACoal | Unconsolidated Mines |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments in unconsolidated subsidiaries | 12,400 | 14,900
Balance Sheet |  |
Dividends from unconsolidated mines | 45,800 | 49,000
NACoal | Unconsolidated Mines |  |
Schedule of Equity Method Investments [Line Items] |  |
Maximum Risk of Loss | 5,000 | 7,100
NACoal | Variable Interest Entity, Not Primary Beneficiary | Unconsolidated Mines |  |
Income Statement [Abstract] |  |
Revenues | 610,734 | 664,824
Gross profit | 63,646 | 47,748
Income before income taxes | 49,994 | 57,250
Net (loss) income | 43,714 | 48,467
Balance Sheet |  |
Current assets | 124,387 | 214,098
Non-current assets | 814,226 | 805,833
Current liabilities | 161,606 | 116,701
Non-current liabilities | $ 772,003 | $ 896,134

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