Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net income	$ 91,581	$ 80,535	$ 121,119	$ 134,451
Other comprehensive income (loss):
Foreign currency translation adjustment	(4,068)	4,548	(9,468)	6,222
Change in net unrealized gain (loss) on derivatives	5,084	(3,456)	14,482	(4,258)
Comprehensive income	$ 92,597	$ 81,627	$ 126,133	$ 136,415