Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (605)	$ 17,250	$ 22,168	$ 38,652
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(2,598)	(8,993)	(7,535)	(7,860)
Actuarial losses related to defined benefit pension plans	(573)	(18)	(803)	(56)
Reclassification adjustment from sale of investment	1,376	0	1,376	328
Total other comprehensive loss	(1,795)	(9,011)	(6,962)	(7,588)
Total comprehensive (loss) income	$ (2,400)	$ 8,239	$ 15,206	$ 31,064