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Business Segments (Segment Reporting Information) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]    
Revenues $ 237,708 $ 214,794
Cost of sales 207,952 200,203
Earnings of unconsolidated operations 57,476 49,994
Operating expenses 65,139 134,722
Operating profit (loss) 35,705 (70,137)
Expenditures for property, plant and equipment and acquisition of mineral interests 55,419 82,122
Depreciation, depletion and amortization 24,652 29,387
Operating Segments | Coal Mining    
Segment Reporting Information [Line Items]    
Revenues 68,611 85,415
Cost of sales 79,375 108,760
Earnings of unconsolidated operations 51,821 44,633
Operating expenses 30,358 92,630
Operating profit (loss) 24,311 (71,342)
Expenditures for property, plant and equipment and acquisition of mineral interests 8,292 6,609
Depreciation, depletion and amortization 9,476 17,569
Operating Segments | NAMining    
Segment Reporting Information [Line Items]    
Revenues 119,600 90,532
Cost of sales 110,821 83,719
Earnings of unconsolidated operations 5,010 5,361
Operating expenses 8,017 8,826
Operating profit (loss) 5,772 3,348
Expenditures for property, plant and equipment and acquisition of mineral interests 30,556 36,073
Depreciation, depletion and amortization 9,811 8,172
Operating Segments | Minerals Management    
Segment Reporting Information [Line Items]    
Revenues 34,579 32,985
Cost of sales 5,234 3,969
Earnings of unconsolidated operations 647 0
Operating expenses 1,065 9,598
Operating profit (loss) 28,927 19,418
Expenditures for property, plant and equipment and acquisition of mineral interests 1,079 38,881
Depreciation, depletion and amortization 4,273 3,067
Unallocated Items    
Segment Reporting Information [Line Items]    
Revenues 17,707 8,459
Cost of sales 15,323 6,252
Earnings of unconsolidated operations (2) 0
Operating expenses 25,699 23,668
Operating profit (loss) (23,317) (21,461)
Expenditures for property, plant and equipment and acquisition of mineral interests 15,492 559
Depreciation, depletion and amortization 1,092 579
Eliminations    
Segment Reporting Information [Line Items]    
Revenues (2,789) (2,597)
Cost of sales (2,801) (2,497)
Operating profit (loss) $ 12 $ (100)