Revenue Recognition - Schedule of revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Revenues	$ 744,601	$ 863,835	$ 2,371,826	$ 2,865,129
North America revenues
Disaggregation of Revenue [Line Items]
Revenues	360,654	377,551	1,060,128	1,031,735
Seaborne revenues
Disaggregation of Revenue [Line Items]
Revenues	383,947	486,284	1,311,698	1,833,394
Operating Segments | MET
Disaggregation of Revenue [Line Items]
Revenues	432,835	444,306	1,420,758	1,640,970
Operating Segments | MET | North America revenues
Disaggregation of Revenue [Line Items]
Revenues	108,895	70,491	274,017	125,906
Operating Segments | MET | Seaborne revenues
Disaggregation of Revenue [Line Items]
Revenues	323,940	373,815	1,146,741	1,515,064
Operating Segments | Thermal
Disaggregation of Revenue [Line Items]
Revenues	311,766	419,529	951,068	1,224,159
Operating Segments | Thermal | North America revenues
Disaggregation of Revenue [Line Items]
Revenues	251,759	307,060	786,111	905,829
Operating Segments | Thermal | Seaborne revenues
Disaggregation of Revenue [Line Items]
Revenues	60,007	112,469	164,957	318,330
Corporate, Other and Eliminations
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Corporate, Other and Eliminations | North America revenues
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Corporate, Other and Eliminations | Seaborne revenues
Disaggregation of Revenue [Line Items]
Revenues	$ 0	$ 0	$ 0	$ 0