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
Net income	$ 31,969	$ 21,382	$ 74,271	$ 22,617
Other comprehensive income (loss):
Foreign currency translation adjustment	(25,229)	(37,851)	(20,995)	(18,789)
Comprehensive income (loss)	6,105	(15,596)	52,527	3,237
Foreign Currency Hedges [Member]
Other comprehensive income (loss):
Unrealized gain (loss) on derivatives arising during period, net of tax benefit (expense)	(556)	(179)	(33)	(390)
Interest Rate Swaps [Member]
Other comprehensive income (loss):
Unrealized gain (loss) on derivatives arising during period, net of tax benefit (expense)	$ (79)	$ 1,052	$ (716)	$ (201)