Other Income (Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Component of Other Income (Expense), Nonoperating [Line Items]
Other income (expense)	$ (15)	$ 827
Gain (loss) on currency transactions [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other income (expense)	(730)	1,115
Hedge ineffectiveness
Component of Other Income (Expense), Nonoperating [Line Items]
Other income (expense)	370	(399)
Other non-operating income (expense) [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other income (expense)	$ 345	$ 111