Revenue Recognition - Schedule of revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 608,751	$ 757,294	$ 1,288,941	$ 1,627,225
North America revenues
Disaggregation of Revenue [Line Items]
Revenues	251,296	340,807	492,543	699,474
Seaborne revenues
Disaggregation of Revenue [Line Items]
Revenues	357,455	416,487	796,398	927,751
Operating Segments | MET
Disaggregation of Revenue [Line Items]
Revenues	375,958	451,752	793,023	987,923
Operating Segments | MET | North America revenues
Disaggregation of Revenue [Line Items]
Revenues	67,213	93,715	102,797	165,122
Operating Segments | MET | Seaborne revenues
Disaggregation of Revenue [Line Items]
Revenues	308,745	358,037	690,226	822,801
Operating Segments | Thermal
Disaggregation of Revenue [Line Items]
Revenues	232,793	305,542	495,918	639,302
Operating Segments | Thermal | North America revenues
Disaggregation of Revenue [Line Items]
Revenues	184,083	247,092	389,746	534,352
Operating Segments | Thermal | Seaborne revenues
Disaggregation of Revenue [Line Items]
Revenues	48,710	58,450	106,172	104,950
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