Derivative Instruments and Hedging Activities (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Gain (loss) recognized on non-designated derivative instruments:
Gain (loss) recognized on non-designated derivative instruments, total	$ 2,450	$ 13,638	$ (5,614)	$ 19,096
Foreign Exchange Contract [Member] | Interest Expense [Member]
Gain (loss) recognized on non-designated derivative instruments:
Gain (loss) recognized on non-designated derivative instruments, total	(2,028)	(1,573)	(3,876)	(3,059)
Foreign Exchange Contract [Member] | Foreign Currency Gain Loss [Member]
Gain (loss) recognized on non-designated derivative instruments:
Gain (loss) recognized on non-designated derivative instruments, total	$ 4,478	$ 15,211	$ (1,738)	$ 22,155