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Components of Coal Workers' Pneumoconiosis (CWP) and Workers' Compensation Net Periodic Benefit Costs (Tables)
 3 Months Ended
Mar. 31, 2025
Retirement Benefits [Abstract]  
Schedule of Changes in Accumulated Postemployment Benefit Obligations
The components of Net Periodic Benefit Cost are as follows:
CWPWorkers' Compensation
Three Months Ended
March 31,		Three Months Ended
March 31,
2025202420252024
Service Cost$1,816 $746 $1,728 $1,464 
Interest Cost3,419 2,066 555 573 
Amortization of Actuarial Loss (Gain)42 109 (460)(540)
Fees, Premiums and Assessments— — 1,736 464 
Net Periodic Benefit Cost$5,277 $2,921 $3,559 $1,961