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Components of Coal Workers' Pneumoconiosis (CWP) and Workers' Compensation Net Periodic Benefit Costs (Tables)
 9 Months Ended
Sep. 30, 2025
Retirement Benefits [Abstract]  
Schedule of Changes in Accumulated Postemployment Benefit Obligations
The components of Net Periodic Benefit Cost were as follows:
CWPWorkers' Compensation
Three Months Ended
September 30,		Nine Months Ended
September 30,		Three Months Ended
September 30,		Nine Months Ended
September 30,
20252024202520242025202420252024
Service Cost$2,003 $746 $5,809 $2,239 $1,728 $1,465 $5,184 $4,393 
Interest Cost3,687 2,066 10,776 6,198 555 572 1,665 1,717 
Amortization of Actuarial Loss (Gain)42 109 127 326 (460)(540)(1,380)(1,620)
Fees, Premiums and Assessments— — — — 2,273 464 6,383 1,393 
Net Periodic Benefit Cost$5,732 $2,921 $16,712 $8,763 $4,096 $1,961 $11,852 $5,883