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Business Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 61,369 | $ 45,896 | $ 116,392 | $ 91,001
Operating profit (loss) | 29,683 | 8,670 | 44,627 | 17,000
Expenditures for property, plant and equipment and acquisition of mineral interests | 20,269 | 11,251 | 24,918 | 16,127
Depreciation, depletion and amortization | 6,488 | 5,617 | 12,615 | 11,202
Operating segments | Coal Mining |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 26,602 | 20,689 | 47,564 | 42,631
Operating profit (loss) | 21,175 | 7,627 | 28,527 | 15,784
Expenditures for property, plant and equipment and acquisition of mineral interests | 6,280 | 3,115 | 8,000 | 4,732
Depreciation, depletion and amortization | 4,388 | 4,073 | 8,426 | 8,228
Operating segments | NAMining |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 22,814 | 19,860 | 44,218 | 37,799
Operating profit (loss) | 1,257 | 1,698 | 2,528 | 2,355
Expenditures for property, plant and equipment and acquisition of mineral interests | 6,561 | 2,952 | 8,381 | 5,818
Depreciation, depletion and amortization | 1,493 | 984 | 2,960 | 1,935
Operating segments | Minerals Management |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 11,962 | 5,608 | 24,716 | 11,108
Operating profit (loss) | 13,073 | 4,173 | 24,701 | 8,408
Expenditures for property, plant and equipment and acquisition of mineral interests | 116 | 5,105 | 949 | 5,498
Depreciation, depletion and amortization | 543 | 522 | 1,121 | 969
Unallocated Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 617 | 910 | 809 | 1,053
Operating profit (loss) | (5,952) | (4,795) | (11,391) | (9,568)
Expenditures for property, plant and equipment and acquisition of mineral interests | 7,312 | 79 | 7,588 | 79
Depreciation, depletion and amortization | 64 | 38 | 108 | 70
Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | (626) | (1,171) | (915) | (1,590)
Operating profit (loss) | $ 130 | $ (33) | $ 262 | $ 21

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