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Segment Information (Schedule Of Operating Segment Results) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Segment
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Segment Reporting [Abstract]          
Number of reportable segments | Segment     2    
Segment Reporting Information [Line Items]          
Revenues $ 570,222 $ 592,349 $ 1,125,405 $ 1,167,644  
Adjusted EBITDA 105,564 85,385 212,818 190,298  
Depreciation, depletion and amortization 26,524 30,549 51,797 60,252  
Accretion on asset retirement obligations 5,137 6,993 10,274 13,985  
Total assets 1,889,530 1,949,413 1,889,530 1,949,413 $ 1,887,060
Capital expenditures 48,708 20,596 87,854 30,049  
Operating Segments | PRB          
Segment Reporting Information [Line Items]          
Revenues 210,149 229,878 422,878 475,306  
Adjusted EBITDA 14,696 26,491 35,279 53,993  
Depreciation, depletion and amortization 4,880 8,304 9,745 16,727  
Accretion on asset retirement obligations 3,135 4,885 6,271 9,771  
Total assets 236,527 379,613 236,527 379,613  
Capital expenditures 13,209 3,065 13,623 3,763  
Operating Segments | MET          
Segment Reporting Information [Line Items]          
Revenues 261,245 259,032 514,507 497,379  
Adjusted EBITDA 101,936 86,657 193,470 170,399  
Depreciation, depletion and amortization 17,343 18,018 33,725 35,003  
Accretion on asset retirement obligations 531 469 1,061 937  
Total assets 605,657 551,012 605,657 551,012  
Capital expenditures 31,150 11,899 62,374 17,728  
Operating Segments | Other Thermal          
Segment Reporting Information [Line Items]          
Revenues 98,205 99,814 184,183 191,334  
Adjusted EBITDA 10,922 11,842 17,041 27,510  
Depreciation, depletion and amortization 3,689 3,701 7,124 7,536  
Accretion on asset retirement obligations 603 565 1,207 1,130  
Total assets 136,899 134,319 136,899 134,319  
Capital expenditures 3,211 2,559 9,461 3,765  
Corporate, Other and Eliminations          
Segment Reporting Information [Line Items]          
Revenues 623 3,625 3,837 3,625  
Adjusted EBITDA (21,990) (39,605) (32,972) (61,604)  
Depreciation, depletion and amortization 612 526 1,203 986  
Accretion on asset retirement obligations 868 1,074 1,735 2,147  
Total assets 910,447 884,469 910,447 884,469  
Capital expenditures $ 1,138 $ 3,073 $ 2,396 $ 4,793