Concentration of Credit Risk and Major Customers - Schedule of Concentration of Credit Risk in Outstanding Trade Receivables (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Concentration Risk [Line Items]
Total Trade Receivables	$ 349,878	$ 138,015
Less: Allowance for credit losses	(645)	(1,265)
Total Trade Receivables, net	349,233	136,750
Accounts Receivable | Customer Concentration Risk | Electric coal utilities
Concentration Risk [Line Items]
Total Trade Receivables	64,704	30,162
Accounts Receivable | Customer Concentration Risk | Coal exporters and industrial customers
Concentration Risk [Line Items]
Total Trade Receivables	122,879	69,630
Accounts Receivable | Customer Concentration Risk | Steel and coke producers
Concentration Risk [Line Items]
Total Trade Receivables	158,887	33,126
Accounts Receivable | Customer Concentration Risk | Other
Concentration Risk [Line Items]
Total Trade Receivables	$ 3,408	$ 5,097