Derivative Financial Instruments (Details 4) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Other (expense)/income, net	$ (1,064)	$ 418	$ (595)	$ 693
Derivative instruments not designated as hedging instruments, gain (loss), net	(1,463)		(4,304)
Cross-currency swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest (expense)/income	(1,566)		(4,526)
Other (expense)/income, net	$ 103		$ 222