Workers' Compensation Expense (Tables)

3 Months Ended

Mar. 31, 2012

Workers' Compensation Expense [Abstract]

Workers' Compensation Expense

	Three Months Ended March 31,
	2012	2011
	(In thousands)
Service cost	$           968	$	193
Interest cost	680		254
Net amortization	277		(101)
Total occupational disease	1,925		346
Traumatic injury claims and assessments	5,176		2,325
Total workers’ compensation expense	$        7,101	$	2,671