Revenue Recognition - Schedule of revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Revenues	$ 757,294	$ 1,133,358	$ 1,627,225	$ 2,001,294
North America revenues
Disaggregation of Revenue [Line Items]
Revenues	340,807	344,969	699,474	654,183
Seaborne revenues
Disaggregation of Revenue [Line Items]
Revenues	416,487	788,389	927,751	1,347,111
Operating Segments | MET
Disaggregation of Revenue [Line Items]
Revenues	451,752	724,492	987,923	1,196,664
Operating Segments | MET | North America revenues
Disaggregation of Revenue [Line Items]
Revenues	93,715	51,764	165,122	55,415
Operating Segments | MET | Seaborne revenues
Disaggregation of Revenue [Line Items]
Revenues	358,037	672,728	822,801	1,141,249
Operating Segments | Thermal
Disaggregation of Revenue [Line Items]
Revenues	305,542	408,866	639,302	804,630
Operating Segments | Thermal | North America revenues
Disaggregation of Revenue [Line Items]
Revenues	247,092	293,205	534,352	598,768
Operating Segments | Thermal | Seaborne revenues
Disaggregation of Revenue [Line Items]
Revenues	58,450	115,661	104,950	205,862
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