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Unconsolidated Subsidiaries (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Schedule of Equity Method Investments [Line Items] |  |
Variable interest entity, reporting entity involvement, maximum risk of loss | $ 5,500 | $ 5,000
Other non-current assets |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments in unconsolidated subsidiaries | $ 14,100 | 12,400
Unconsolidated Subsidiaries |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership (percent) | 100.00% |
Investments in unconsolidated subsidiaries | $ 14,137 | 12,371
Unconsolidated Mines | NACoal |  |
Schedule of Equity Method Investments [Line Items] |  |
Dividends from unconsolidated mines | $ 48,800 | $ 45,800

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