Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 24,226	$ 19,876	$ 43,166	$ 45,362
Other comprehensive income (loss), net of tax:
Currency translation adjustments (net of income tax of $0 in 2015 and 2014)	6,606	(570)	(21,335)	(103)
Change in unrecognized net periodic pension costs (net of income tax of $141 and $285 in 2015 and $90 and $186 in 2014)	260	112	518	219
Other (net of income tax of $0 in 2015 and $8 and $16 in 2014)	(8)	15	30	6
Total other comprehensive income (loss), net of tax	6,858	(443)	(20,787)	122
Comprehensive income	$ 31,084	$ 19,433	$ 22,379	$ 45,484