Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 40,167	$ 28,351
Other comprehensive loss, net of tax:
Foreign currency translation adjustments	2,068	(20,107)
Interest rate hedges – net change in deferred loss	(7,133)	(1,104)
Pension – net change in deferred actuarial loss	37	53
Other comprehensive loss, net of tax	(5,028)	(21,158)
Comprehensive income	$ 35,139	$ 7,193