Segment Information - Reconciliation of Operating Income (loss) to Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting [Abstract]
Income from continuing operations before income taxes	$ 25,713	$ 24,526
Restructuring charges	470	731
Interest expense	3,902	2,473
Currency exchange losses (gains), net	1,950	(2,548)
Other income, net	(888)	(641)
Operating income (loss)	$ 31,147	$ 24,541