Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Consolidated Statements Of Comprehensive Income (Loss) [Abstract]
Net income (loss)	$ 49,161	$ (15,370)	$ 95,994	$ 70,976
Foreign currency translation adjustments	36,472	(5,525)	27,734	131,659
Comprehensive income (loss)	$ 85,633	$ (20,895)	$ 123,728	$ 202,635