CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) [Abstract]
Net (loss) income	$ (2,017)	$ 61,949	$ 83,324	$ 163,293
Other comprehensive (loss) income before tax:
Foreign currency translation adjustments	5,496	(14,344)	949	(2,858)
Derivative instruments accounted for as hedges, net of reclassification adjustments	(830)	(2,318)	(2,304)	(888)
Other comprehensive (loss) income, before tax	4,666	(16,662)	(1,355)	(3,746)
Income tax benefit related to other comprehensive income (loss) items	324	904	899	346
Other comprehensives income (loss), net of tax	4,990	(15,758)	(456)	(3,400)
Comprehensive income	$ 2,973	$ 46,191	$ 82,868	$ 159,893