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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 140,990 | $ 135,375
Goods transferred at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 66,102 | 78,849
Services transferred over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 74,888 | 56,526
Operating Segments | Coal Mining |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 68,701 | 81,549
Operating Segments | NAMining |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 42,823 | 36,950
Operating Segments | Minerals Management |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 30,119 | 17,352
Unallocated Items |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 790 | 665
Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ (1,443) | $ (1,141)

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