Revenue Recognition - Schedule of revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Revenues	$ 869,931	$ 867,936
North America revenues
Disaggregation of Revenue [Line Items]
Revenues	358,666	309,214
Seaborne revenues
Disaggregation of Revenue [Line Items]
Revenues	511,265	558,722
Operating Segments | MET
Disaggregation of Revenue [Line Items]
Revenues	536,172	472,171
Operating Segments | MET | North America revenues
Disaggregation of Revenue [Line Items]
Revenues	71,407	3,651
Operating Segments | MET | Seaborne revenues
Disaggregation of Revenue [Line Items]
Revenues	464,765	468,520
Operating Segments | Thermal
Disaggregation of Revenue [Line Items]
Revenues	333,759	395,765
Operating Segments | Thermal | North America revenues
Disaggregation of Revenue [Line Items]
Revenues	287,259	305,563
Operating Segments | Thermal | Seaborne revenues
Disaggregation of Revenue [Line Items]
Revenues	46,500	90,202
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