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Other Accrued Liabilities
 6 Months Ended
Jun. 30, 2023
Other Liabilities Disclosure [Abstract]  
Other Accrued Liabilities OTHER ACCRUED LIABILITIES:
June 30,
2023		December 31,
2022
Subsidence Liability$98,302 $96,623 
Accrued Compensation and Benefits54,813 67,893 
Accrued Interest6,591 7,942 
Accrued Other Taxes6,511 10,551 
Accrued Income Taxes5,394 1,513 
Other18,685 9,880 
Current Portion of Long-Term Liabilities:  
Asset Retirement Obligations32,974 29,644 
Postretirement Benefits Other than Pensions21,944 22,436 
Pneumoconiosis Benefits12,622 12,723 
Workers' Compensation9,923 10,451 
Total Other Accrued Liabilities$267,759 $269,656