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Components of Coal Workers' Pneumoconiosis (CWP) and Workers' Compensation Net Periodic Benefit Costs
 9 Months Ended
Sep. 30, 2025
Retirement Benefits [Abstract]  
Components of Coal Workers' Pneumoconiosis (CWP) and Workers' Compensation Net Periodic Benefit Costs COMPONENTS OF COAL WORKERS’ PNEUMOCONIOSIS (CWP) AND WORKERS’ COMPENSATION NET PERIODIC BENEFIT COSTS:
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 
Service costs and fees, premiums and assessments related to CWP and workers’ compensation are reflected in Cost of Sales in the Consolidated Statements of Income (Loss). All other expenses related to CWP and workers’ compensation are reflected in Non-Service Related Pension and Postretirement Benefit Costs in the Consolidated Statements of Income (Loss). Amounts reclassified out of accumulated other comprehensive (loss) income are reflected in Non-Service Related Pension and Postretirement Benefit Costs in the Consolidated Statements of Income (Loss).