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Segment Information (Schedule Of Operating Segment Results) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2022
USD ($)
item
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Segment Reporting Information [Line Items]      
Number of distinct lines of business | item 2    
Revenues $ 867,936 $ 357,543  
Adjusted EBITDA 320,983 30,897  
Depreciation, depletion and amortization 32,210 25,797  
Accretion on asset retirement obligations 4,430 5,437  
Total assets 2,150,885 1,774,158 $ 2,117,160
Capital expenditures 22,288 76,758  
Operating Segments | MET      
Segment Reporting Information [Line Items]      
Revenues 472,171 178,781  
Adjusted EBITDA 259,003 41,597  
Depreciation, depletion and amortization 26,952 20,882  
Accretion on asset retirement obligations 553 508  
Total assets 1,001,734 886,840  
Capital expenditures 17,580 76,021  
Operating Segments | Thermal      
Segment Reporting Information [Line Items]      
Revenues 395,765 177,540  
Adjusted EBITDA 100,500 13,081  
Depreciation, depletion and amortization 5,032 4,688  
Accretion on asset retirement obligations 3,444 4,419  
Total assets 227,009 196,957  
Capital expenditures 4,002 288  
Corporate, Other and Eliminations      
Segment Reporting Information [Line Items]      
Revenues 0 1,222  
Adjusted EBITDA (38,520) (23,781)  
Depreciation, depletion and amortization 226 227  
Accretion on asset retirement obligations 433 510  
Total assets 922,142 690,361  
Capital expenditures $ 706 $ 449