Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 86,920	$ 121,310	$ 64,860
Other comprehensive income (loss), net of tax
Foreign currency translation adjustments	(1,632)	(10,096)	(4,932)
Unrealized net gains/(losses) on hedges of a net investment in a foreign operation	27
Unrealized net gains (loss) on hedges of a net investment in a foreign operation		(269)	14,569
Unrealized net losses on cash flow hedges	(4,772)
Unrealized net losses on cash flow hedges		(4,077)	(1,108)
Gains/(losses) on defined benefit plans	(8,358)	134	4,099
Other comprehensive income (loss)	(14,734)	(14,308)	12,628
Comprehensive income	$ 72,186	$ 107,002	$ 77,488