Derivative Financial Instruments Derivative Instruments Not Designated as Hedges (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Other income/(expense), net	$ 682	$ 984
Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss), net	(818)	(1,145)
Not Designated as Hedging Instrument [Member] | Cross-currency swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest expense, net	(814)	(1,318)
Other income/(expense), net	$ (4)	$ 173