Other Income (Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Component of Other Income (Expense), Nonoperating [Line Items]
Other income (expense)	$ (435)	$ (591)
Gain (loss) on currency translation [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other income (expense)	(283)	(969)
Hedge ineffectiveness [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other income (expense)	(222)	419
Other non-operating income (expense) [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other income (expense)	$ 70	$ (41)