Other Income (Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Component of Other Income (Expense), Nonoperating [Line Items]
Other income (expense)	$ (706)	$ (195)	$ (1,090)	$ (359)
Gain (loss) on currency translation [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other income (expense)	(636)	(374)	(438)	(765)
Hedge ineffectiveness
Component of Other Income (Expense), Nonoperating [Line Items]
Other income (expense)	(78)	(666)	(923)	(436)
Other non-operating income (expense) [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other income (expense)	$ 8	$ 845	$ 271	$ 842