Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Consolidated Statements of Comprehensive Income (Unaudited) [Abstract]
Net Income	$ 60,407	$ 41,701	$ 108,236	$ 57,009
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation adjustment	(3,108)	2,129	1,268	4,537
Net unrealized gains/(losses) on foreign currency cash flow hedges	(1,461)	(826)	1,960	145
Less: Reclassification adjustment for realized losses (gains) in current earnings	(87)	(93)	130	(104)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(4,656)	1,210	3,358	4,578
Comprehensive Income	$ 55,751	$ 42,911	$ 111,594	$ 61,587