Derivative Financial Instruments Derivative Instruments Not Designated as Hedges (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Other income/(loss), net	$ 920	$ (896)	$ 1,186	$ (223)
Not designated as hedging instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss), net	(892)	(691)	(1,270)	(1,510)
Cross-currency swap [Member] | Not designated as hedging instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest (expense)/income	(630)	(717)	(1,184)	(1,532)
Other income/(loss), net	$ (262)	$ 26	$ (86)	$ 22