Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Consolidated Statements of Comprehensive Income (Unaudited) [Abstract]
Net Income (Loss) Attributable to Parent	$ 16,267	$ 68,308	$ 97,206	$ 142,669
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation adjustment	(9,629)	(3,392)	(20,355)	1,578
Net unrealized gains/(losses) on foreign currency cash flow hedges	(110)	1,239	199	656
Less: Reclassification adjustment for realized losses/gains in current earnings	(10)	(527)	(1,323)	(970)
Total	(9,749)	(2,680)	(21,479)	1,264
Comprehensive Income	$ 6,518	$ 65,628	$ 75,727	$ 143,933