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Components of Coal Workers' Pneumoconiosis (CWP) and Workers' Compensation Net Periodic Benefit Costs (Tables)
 9 Months Ended
Sep. 30, 2024
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
September 30,		Nine Months Ended
September 30,		Three Months Ended
September 30,		Nine Months Ended
September 30,
20242023202420232024202320242023
Service Cost$746 $578 $2,239 $1,734 $1,465 $1,400 $4,393 $4,198 
Interest Cost2,066 2,071 6,198 6,214 572 628 1,717 1,885 
Amortization of Actuarial Loss (Gain)109 (261)326 (784)(540)(512)(1,620)(1,537)
State Administrative Fees and Insurance Bond Premiums— — — — 464 471 1,393 1,482 
Net Periodic Benefit Cost$2,921 $2,388 $8,763 $7,164 $1,961 $1,987 $5,883 $6,028