Revenue From Contracts With Customers - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	$ 2,164,406	$ 2,506,635	$ 2,280,018
Coal
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	1,786,926	2,106,366	2,018,662
Power Generation
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	861,566	1,019,180	1,302,313
Industrial
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	563,636	772,642	411,103
Metallurgical
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	361,724	314,544	305,246
Terminal Revenue
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	87,746	106,166	78,915
Freight Revenue
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	274,026	294,103	182,441
Other Revenue
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	15,708
Domestic | Coal
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	713,728	717,633	944,534
Domestic | Power Generation
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	649,056	672,509	908,666
Domestic | Industrial
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	19,811	34,453	19,231
Domestic | Metallurgical
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	44,861	10,671	16,637
Export | Coal
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	1,073,198	1,388,733	1,074,128
Export | Power Generation
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	212,510	346,671	393,647
Export | Industrial
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	543,825	738,189	391,872
Export | Metallurgical
Disaggregation of Revenue [Line Items]
Total Revenue from Contracts with Customers	$ 316,863	$ 303,873	$ 288,609