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Revenue Recognition (Schedule of Revenues) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Disaggregation of Revenue [Line Items]    
Revenues $ 867,936 $ 357,543
North America revenues    
Disaggregation of Revenue [Line Items]    
Revenues 309,214 190,270
Seaborne revenues    
Disaggregation of Revenue [Line Items]    
Revenues 558,722 167,273
Operating Segments | MET    
Disaggregation of Revenue [Line Items]    
Revenues 472,171 178,781
Operating Segments | MET | North America revenues    
Disaggregation of Revenue [Line Items]    
Revenues 3,651 24,835
Operating Segments | MET | Seaborne revenues    
Disaggregation of Revenue [Line Items]    
Revenues 468,520 153,946
Operating Segments | Thermal    
Disaggregation of Revenue [Line Items]    
Revenues 395,765 177,540
Operating Segments | Thermal | North America revenues    
Disaggregation of Revenue [Line Items]    
Revenues 305,563 164,213
Operating Segments | Thermal | Seaborne revenues    
Disaggregation of Revenue [Line Items]    
Revenues 90,202 13,327
Corporate, Other and Eliminations    
Disaggregation of Revenue [Line Items]    
Revenues 0 1,222
Corporate, Other and Eliminations | North America revenues    
Disaggregation of Revenue [Line Items]    
Revenues 0 1,222
Corporate, Other and Eliminations | Seaborne revenues    
Disaggregation of Revenue [Line Items]    
Revenues $ 0 $ 0