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Workers' Compensation And Pneumoconiosis (Tables)

9 Months Ended

Sep. 30, 2025

Defined Benefit Plan Disclosure [Line Items]

Reconciliation of changes in workers' compensation liability

The changes in the workers’ compensation liability, including current and long-term liability balances, for each of the periods presented were as follows:


		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2025			2024			2025			2024

		(in thousands)
Beginning balance		$	49,234		$	47,194		$	47,870		$	47,975
Changes in accruals			3,418			3,658			10,213			10,148
Payments			(3,608)			(3,784)			(10,672)			(11,278)
Interest accretion			569			509			1,706			1,527
Valuation loss (gain) (1)			—			—			496			(795)
Ending balance		$	49,613		$	47,577		$	49,613		$	47,577

(1)

Our estimate of the liability for the present value of current workers′ compensation benefits is based on our actuarial calculations. Our actuarial calculations are based on a blend of actuarial projection methods and numerous assumptions including claims development patterns, mortality, medical costs and interest rates. The valuation loss in 2025 is due to a decrease in the discount rate from 5.17% on December 31, 2024 to 4.92% on June 30, 2025. The valuation gain in 2024 is due to an increase in the discount rate from 4.66% on December 31, 2023 to 5.18% on June 30, 2024.

Pneumoconiosis benefits

Defined Benefit Plan Disclosure [Line Items]

Components of net periodic benefit cost


		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2025			2024			2025			2024

		(in thousands)
Service cost		$	864		$	864		$	2,612		$	2,583
Interest cost (1)			1,677			1,558			5,029			4,674
Net amortization (1)			232			839			696			2,517
Net periodic benefit cost		$	2,773		$	3,261		$	8,337		$	9,774

(1)	Interest cost and net amortization are included in the Other income (expense) line item within our condensed consolidated statements of income.