Workers' Compensation Expense (Tables)

12 Months Ended

Dec. 31, 2014

Workers' Compensation Expense [Abstract]

Workers' compensation liabilities

	December 31,
	2014		2013
	(In thousands)
Occupational disease costs	$	72,749	$	55,228
Traumatic and other workers' compensation claims	38,256		35,268
Total obligations	111,005		90,496
Less amount included in accrued expenses	16,714		12,434
Noncurrent obligations	$	94,291	$	78,062

Workers' Compensation Expense

		Year Ended December 31,
		2014		2013		2012
	(In thousands)
Total occupational disease		4,432		6,137		6,962
Traumatic injury claims and assessments		19,924		21,089		26,565
Total workers’ compensation expense		$	24,356	$	27,226	$	33,527