Workers' Compensation Expense

9 Months Ended

Sep. 30, 2013

Workers' Compensation Expense [Abstract]

Workers' Compensation Expense

Workers’ Compensation Expense

The following table details the components of workers’ compensation expense:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
	(In thousands)
Service cost	$	363	$	419	$	1,373	$	1,458
Interest cost	709		629		2,022		1,708
Net amortization	262		—		731		(574		)
Curtailments	816		—		816		1,933
Total occupational disease	2,150		1,048		4,942		4,525
Traumatic injury claims and assessments	4,114		7,453		16,263		19,052
Total workers’ compensation expense	$	6,264	$	8,501	$	21,205	$	23,577