Workers' Compensation Expense (Tables)

9 Months Ended

Sep. 30, 2011

Workers' Compensation Expense [Abstract]

Workers' Compensation Expense

	Three Months Ended September 30						Nine Months Ended September 30
	2011			2010			2011			2010
	(In thousands)						(In thousands)
Self-insured occupational disease benefits:
Service cost	$	807		$	182		$	1,246		$	545
Interest cost		619			169			1,177			507
Net amortization		(109	)		(465	)		(370	)		(1,395	)
Total occupational disease		1,317			(114	)		2,053			(343	)
Traumatic injury claims and assessments		5,207			2,642			10,856			6,562
Total workers' compensation expense	$	6,524		$	2,528		$	12,909		$	6,219