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Business Segments (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Segment Reporting Information [Line Items] |  |
Revenues | $ 53,289 | $ 50,141
Cost of sales | 46,271 | 46,784
Earnings of unconsolidated operations | 13,307 | 13,824
Operating expenses | 15,568 | 15,367
Operating profit (loss) | 4,757 | 1,814
Expenditures for property, plant and equipment and acquisition of mineral interests | 14,483 | 7,879
Depreciation, depletion and amortization | 5,692 | 7,019
Operating segments | Coal Mining |  |
Segment Reporting Information [Line Items] |  |
Revenues | 15,545 | 20,653
Cost of sales | 20,943 | 25,878
Earnings of unconsolidated operations | 12,007 | 12,466
Operating expenses | 7,026 | 6,928
Operating profit (loss) | (417) | 313
Expenditures for property, plant and equipment and acquisition of mineral interests | 1,794 | 2,686
Depreciation, depletion and amortization | 2,214 | 4,240
Operating segments | NAMining |  |
Segment Reporting Information [Line Items] |  |
Revenues | 24,483 | 20,633
Cost of sales | 21,671 | 19,241
Earnings of unconsolidated operations | 1,365 | 1,358
Operating expenses | 1,822 | 1,920
Operating profit (loss) | 2,355 | 830
Expenditures for property, plant and equipment and acquisition of mineral interests | 5,818 | 4,423
Depreciation, depletion and amortization | 2,256 | 1,886
Operating segments | Minerals Management |  |
Segment Reporting Information [Line Items] |  |
Revenues | 10,401 | 8,285
Cost of sales | 1,364 | 1,052
Earnings of unconsolidated operations | (65) | 0
Operating expenses | 1,042 | 1,189
Operating profit (loss) | 7,930 | 6,044
Expenditures for property, plant and equipment and acquisition of mineral interests | 136 | 344
Depreciation, depletion and amortization | 993 | 811
Unallocated Items |  |
Segment Reporting Information [Line Items] |  |
Revenues | 3,262 | 1,191
Cost of sales | 2,712 | 1,214
Operating expenses | 5,678 | 5,330
Operating profit (loss) | (5,128) | (5,353)
Expenditures for property, plant and equipment and acquisition of mineral interests | 6,735 | 426
Depreciation, depletion and amortization | 229 | 82
Eliminations |  |
Segment Reporting Information [Line Items] |  |
Revenues | (402) | (621)
Cost of sales | (419) | (601)
Operating profit (loss) | $ 17 | $ (20)

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