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Other Accrued Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Other Liabilities Disclosure [Abstract]    
Subsidence Liability $ 94,440 $ 96,623
Accrued Compensation and Benefits 54,693 67,893
Accrued Income Taxes 43,522 1,513
Accrued Other Taxes 8,590 10,551
Accrued Interest 5,147 7,942
Other 11,591 9,880
Current Portion of Long-Term Liabilities:    
Asset Retirement Obligations 29,644 29,644
Postretirement Benefits Other than Pensions 22,190 22,436
Pneumoconiosis Benefits 12,673 12,723
Workers' Compensation 10,037 10,451
Total Other Accrued Liabilities $ 292,527 $ 269,656