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Components of Coal Workers' Pneumoconiosis (CWP) and Workers' Compensation Net Periodic Benefit Costs (Tables)
 6 Months Ended
Jun. 30, 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
June 30,		Six Months Ended
June 30,		Three Months Ended
June 30,		Six Months Ended
June 30,
20252024202520242025202420252024
Service Cost$1,990 $747 $3,806 $1,493 $1,728 $1,464 $3,456 $2,928 
Interest Cost3,670 2,066 7,089 4,132 555 572 1,110 1,145 
Amortization of Actuarial Loss (Gain)43 108 85 217 (460)(540)(920)(1,080)
Fees, Premiums and Assessments— — — — 2,374 465 4,110 929 
Net Periodic Benefit Cost$5,703 $2,921 $10,980 $5,842 $4,197 $1,961 $7,756 $3,922