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Unconsolidated Subsidiaries (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |
Investment in unconsolidated subsidiaries | $ 24,611 | $ 20,091
Unconsolidated mines | NACoal |  |
Schedule of Equity Method Investments [Line Items] |  |
Investment in unconsolidated subsidiaries | 24,600 | 20,100
Maximum risk of loss | 5,000 | 4,400
Statement of Operations |  |
Revenue | 734,515 | 766,558
Gross profit | 72,433 | 76,600
Income before income taxes | 65,183 | 66,270
Net income | 54,067 | 55,247
Balance Sheet |  |
Current assets | 183,848 | 182,353
Non-current assets | 837,477 | 860,049
Current liabilities | 141,132 | 146,788
Non-current liabilities | 875,216 | 891,175
Dividends from unconsolidated mines | $ 53,500 | $ 56,000

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