Other Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Component of Other Income (Expense), Nonoperating [Line Items]
Other income (expense)	$ 248	$ (396)	$ 1,035	$ 1,277
Gain (loss) on currency transactions [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other income (expense)	348	(55)	(376)	1,407
Hedge ineffectiveness
Component of Other Income (Expense), Nonoperating [Line Items]
Other income (expense)	11	(42)	1,150	125
Other Non-Operating Income (Expense) [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other income (expense)	$ (111)	$ (299)	$ 261	$ (255)