Other Income (Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Component of Other Income (Expense), Nonoperating [Line Items]
Other income (expense)	$ (322)	$ (435)
Gain (loss) on currency translation [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other income (expense)	(275)	(283)
Hedge ineffectiveness
Component of Other Income (Expense), Nonoperating [Line Items]
Other income (expense)	70	(222)
Other non-operating income (expense) [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other income (expense)	$ (117)	$ 70