Other Income (Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Component of Other Income (Expense), Nonoperating [Line Items]
Other income (expense)	$ (396)	$ 1,340	$ 1,277	$ 1,340
Gain (loss) on currency transactions [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other income (expense)	(55)	1,208	1,407	577
Hedge ineffectiveness
Component of Other Income (Expense), Nonoperating [Line Items]
Other income (expense)	(42)	0	125	70
Other non-operating income (expense) [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other income (expense)	$ (299)	$ 132	$ (255)	$ 693