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Segment Information (Schedule Of Operating Segment Results) (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
item
segment
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
segment
Segment Reporting Information [Line Items]      
Number of reportable segments | segment 2   3
Number of remaining active thermal mines | item 3    
Number of distinct lines of business $ 2    
Revenues 357,543,000 $ 405,232,000  
Adjusted EBITDA 30,897,000 12,915,000  
Depreciation, depletion and amortization 25,797,000 31,308,000  
Accretion on asset retirement obligations 5,437,000 5,006,000  
Total assets 1,774,158,000 1,857,506,000 $ 1,722,472,000
Capital expenditures 76,758,000 87,690,000  
Operating Segments | PRB      
Segment Reporting Information [Line Items]      
Revenues 178,781,000 182,654,000  
Adjusted EBITDA 41,597,000 42,720,000  
Depreciation, depletion and amortization 20,882,000 22,517,000  
Accretion on asset retirement obligations 508,000 486,000  
Total assets 886,840,000 693,227,000  
Capital expenditures 76,021,000 78,648,000  
Operating Segments | MET      
Segment Reporting Information [Line Items]      
Revenues 177,540,000 210,196,000  
Adjusted EBITDA 13,081,000 (1,902,000)  
Depreciation, depletion and amortization 4,688,000 7,545,000  
Accretion on asset retirement obligations 4,419,000 3,842,000  
Total assets 196,957,000 377,806,000  
Capital expenditures 288,000 6,713,000  
Operating Segments | Other Thermal      
Segment Reporting Information [Line Items]      
Revenues 1,222,000 12,382,000  
Adjusted EBITDA (23,781,000) (27,903,000)  
Depreciation, depletion and amortization 227,000 1,246,000  
Accretion on asset retirement obligations 510,000 678,000  
Total assets 690,361,000 786,473,000  
Capital expenditures 449,000 2,329,000  
Corporate, Other and Eliminations      
Segment Reporting Information [Line Items]      
Revenues $ 1,222,000 $ 12,382,000