Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 364,888	$ 221,645	$ 153,330
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation adjustment	6,251	7,843	(2,985)
Net unrealized gains/(losses) on foreign currency cash flow hedges	2,650	3,299	(1,954)
Less: Reclassification adjustment for realized losses (gains) in current earnings	(3,307)	(399)	913
Total	5,594	10,743	(4,026)
Comprehensive Income	$ 370,482	$ 232,388	$ 149,304