Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 66,503	$ 110,882	$ 109,003
Other comprehensive income, net of tax:
Currency translation adjustments (net of income tax of $0 in 2014, $111 in 2013 and $210 in 2012)	(29,539)	6,143	9,749
Change in unrecognized net periodic pension costs (net of income tax of $2,361 in 2014, $2,429 in 2013 and $1,671 in 2012)	(3,844)	3,839	(2,611)
Other (net of income tax of $72 in 2014, $32 in 2013 and $32 in 2012)	(186)	(8)	(50)
Other comprehensive income (loss)	(33,569)	9,974	7,088
Comprehensive income	$ 32,934	$ 120,856	$ 116,091