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Business Segments (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Segment Reporting Information [Line Items] |  |
Revenues | $ 55,023 | $ 45,105
Operating profit (loss) | 14,944 | 8,330
Expenditures for property, plant and equipment and acquisition of mineral interests | 4,649 | 4,876
Depreciation, depletion and amortization | 6,127 | 5,585
Operating segments | Coal Mining |  |
Segment Reporting Information [Line Items] |  |
Revenues | 20,962 | 21,942
Operating profit (loss) | 7,352 | 8,157
Expenditures for property, plant and equipment and acquisition of mineral interests | 1,720 | 1,617
Depreciation, depletion and amortization | 4,038 | 4,155
Operating segments | NAMining |  |
Segment Reporting Information [Line Items] |  |
Revenues | 21,404 | 17,939
Operating profit (loss) | 1,271 | 657
Expenditures for property, plant and equipment and acquisition of mineral interests | 1,820 | 2,866
Depreciation, depletion and amortization | 1,467 | 951
Operating segments | Minerals Management |  |
Segment Reporting Information [Line Items] |  |
Revenues | 12,754 | 5,500
Operating profit (loss) | 11,628 | 4,235
Expenditures for property, plant and equipment and acquisition of mineral interests | 833 | 393
Depreciation, depletion and amortization | 578 | 447
Unallocated Items |  |
Segment Reporting Information [Line Items] |  |
Revenues | 192 | 143
Operating profit (loss) | (5,439) | (4,773)
Expenditures for property, plant and equipment and acquisition of mineral interests | 276 | 0
Depreciation, depletion and amortization | 44 | 32
Eliminations |  |
Segment Reporting Information [Line Items] |  |
Revenues | (289) | (419)
Operating profit (loss) | $ 132 | $ 54

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