Revenue Recognition - Schedule of revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 680,190	$ 869,931
North America revenues
Disaggregation of Revenue [Line Items]
Revenues	241,247	358,666
Seaborne revenues
Disaggregation of Revenue [Line Items]
Revenues	438,943	511,265
Operating Segments | MET
Disaggregation of Revenue [Line Items]
Revenues	417,065	536,172
Operating Segments | MET | North America revenues
Disaggregation of Revenue [Line Items]
Revenues	35,584	71,407
Operating Segments | MET | Seaborne revenues
Disaggregation of Revenue [Line Items]
Revenues	381,481	464,765
Operating Segments | Thermal
Disaggregation of Revenue [Line Items]
Revenues	263,125	333,759
Operating Segments | Thermal | North America revenues
Disaggregation of Revenue [Line Items]
Revenues	205,663	287,259
Operating Segments | Thermal | Seaborne revenues
Disaggregation of Revenue [Line Items]
Revenues	57,462	46,500
Corporate, Other and Eliminations
Disaggregation of Revenue [Line Items]
Revenues	0	0
Corporate, Other and Eliminations | North America revenues
Disaggregation of Revenue [Line Items]
Revenues	0	0
Corporate, Other and Eliminations | Seaborne revenues
Disaggregation of Revenue [Line Items]
Revenues	$ 0	$ 0