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Components of Coal Workers' Pneumoconiosis (CWP) and Workers' Compensation Net Periodic Benefit Costs (Tables)
 6 Months Ended
Jun. 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
June 30,		Six Months Ended
June 30,		Three Months Ended
June 30,		Six Months Ended
June 30,
20242023202420232024202320242023
Service Cost$747 $578 $1,493 $1,156 $1,464 $1,399 $2,928 $2,798 
Interest Cost2,066 2,072 4,132 4,143 572 629 1,145 1,257 
Amortization of Actuarial Loss (Gain)108 (262)217 (523)(540)(513)(1,080)(1,025)
State Administrative Fees and Insurance Bond Premiums— — — — 465 466 929 1,011 
Net Periodic Benefit Cost$2,921 $2,388 $5,842 $4,776 $1,961 $1,981 $3,922 $4,041