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Segment Information - Schedule of Revenue from External Customers (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
USD ($)
customer
Mar. 31, 2024
USD ($)
customer
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues $ 529,667 $ 861,283
Total revenues 531,957 864,072
Export Coal Revenue    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues $ 395,715 $ 701,301
Revenues | Geographic Concentration Risk | Export Coal Revenue    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Concentration risk (as a percent) 75.00% 81.00%
Revenues | Customer Concentration Risk    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Number of customers exceeding 10% of total revenues and 10% of total trade accounts receivable, net | customer 3 4
Revenues | Customer Concentration Risk | Top Customer    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Concentration risk (as a percent) 18.00% 16.00%
Revenues | Customer Concentration Risk | Top 10 Customers    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Concentration risk (as a percent) 73.00% 81.00%
Accounts Receivable | Customer Concentration Risk    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Number of customers exceeding 10% of total revenues and 10% of total trade accounts receivable, net | customer 3 3