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v3.20.2

Business Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 35,355 | $ 41,352 | $ 72,999 | $ 81,449
Operating profit (loss) | 4,482 | 9,161 | 12,062 | 25,534
Expenditures for property, plant and equipment | 7,441 | 1,715 | 12,799 | 5,967
Depreciation, depletion and amortization | 4,624 | 4,238 | 9,168 | 8,051
Operating segments | Coal Mining |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 21,573 | 22,570 | 42,501 | 39,320
Operating profit (loss) | 7,498 | 7,262 | 14,683 | 17,269
Expenditures for property, plant and equipment | 3,844 | 1,511 | 4,667 | 4,251
Depreciation, depletion and amortization | 3,615 | 3,276 | 7,158 | 6,150
Operating segments | NAMining |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 12,048 | 10,728 | 23,672 | 21,503
Operating profit (loss) | 544 | (450) | 1,275 | (385)
Expenditures for property, plant and equipment | 3,163 | 112 | 7,186 | 1,242
Depreciation, depletion and amortization | 652 | 566 | 1,298 | 1,111
Operating segments | Minerals Management |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,987 | 8,242 | 7,228 | 20,928
Operating profit (loss) | 510 | 6,789 | 4,777 | 18,458
Expenditures for property, plant and equipment | 276 | 50 | 739 | 291
Depreciation, depletion and amortization | 327 | 367 | 654 | 733
Unallocated Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 327 | 131 | 353 | 674
Operating profit (loss) | (4,158) | (4,732) | (8,718) | (9,866)
Expenditures for property, plant and equipment | 158 | 42 | 207 | 183
Depreciation, depletion and amortization | 30 | 29 | 58 | 57
Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | (580) | (319) | (755) | (976)
Operating profit (loss) | $ 88 | $ 292 | $ 45 | $ 58

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