Revenue From Contracts With Customers - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	$ 677,597	$ 536,170
Coal
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	583,379	476,384
Power Generation
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	300,511	343,957
Industrial
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	192,118	99,493
Metallurgical
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	90,750	32,934
Terminal Revenue
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	26,711	21,397
Freight Revenue
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	67,507	38,389
Domestic | Coal
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	195,509	225,447
Domestic | Power Generation
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	184,676	223,503
Domestic | Industrial
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	6,508	1,944
Domestic | Metallurgical
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	4,325	0
Export | Coal
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	387,870	250,937
Export | Power Generation
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	115,835	120,454
Export | Industrial
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	185,610	97,549
Export | Metallurgical
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	$ 86,425	$ 32,934