Other Income (Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Component of Other Income (Expense), Nonoperating [Line Items]
Other income (expense)	$ 827	$ (322)
Gain (loss) on currency translation [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other income (expense)	1,115	(275)
Hedge ineffectiveness
Component of Other Income (Expense), Nonoperating [Line Items]
Other income (expense)	(399)	70
Other non-operating income (expense) [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other income (expense)	$ 111	$ (117)