v3.26.3
Components of Coal Workers' Pneumoconiosis (CWP) and Workers' Compensation Net Periodic Benefit Costs (Tables)
 9 Months Ended
Sep. 30, 2026
Compensation Related Costs [Abstract]  
Schedule of Net Periodic Benefit Costs
The components of Net Periodic Benefit Cost were as follows:
Pension BenefitsOther Postretirement Benefits
Three Months Ended
September 30,		Nine Months Ended
September 30,		Three Months Ended
September 30,		Nine Months Ended
September 30,
20262025202620252026202520262025
Service Cost$300 $275 $900 $825 $29 $38 $86 $108 
Interest Cost5,730 6,343 17,189 19,028 2,347 2,992 7,041 8,884 
Expected Return on Plan Assets(7,478)(7,565)(22,436)(22,695)— — — — 
Amortization of Prior Service Credits— — — — (601)(601)(1,804)(1,803)
Recognized Net Actuarial Loss (Gain)2,468 2,159 7,403 6,475 (1,020)(683)(3,059)(2,052)
Net Periodic Benefit Cost$1,020 $1,212 $3,056 $3,633 $755 $1,746 $2,264 $5,137 
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,
20262025202620252026202520262025
Service Cost$1,690 $2,003 $5,071 $5,809 $3,196 $1,728 $9,586 $5,184 
Interest Cost3,382 3,687 10,145 10,776 502 555 1,504 1,665 
Recognized Net Actuarial Loss (Gain)317 42 952 127 (357)(460)(1,069)(1,380)
State Administrative Fees and Insurance Bond Premiums— — — — 779 672 2,340 1,802 
Net Periodic Benefit Cost$5,389 $5,732 $16,168 $16,712 $4,120 $2,495 $12,361 $7,271 
Insured Workers’ Compensation Fees and Assessments519 1,601 1,556 4,581 
Total Workers’ Compensation Expense$4,639 $4,096 $13,917 $11,852