Derivatives Balance Sheet Location (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative assets	$ 1,979	$ 4,143
Other Current Assets | Foreign currency forward contracts | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	1,907	3,626
Other Current Assets | Foreign currency forward contracts | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	72	517
Accrued Expenses
Derivatives, Fair Value [Line Items]
Derivative liabilities	1,137	2,014
Accrued Expenses | Foreign currency forward contracts | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	959	1,443
Accrued Expenses | Foreign currency forward contracts | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	$ 178	$ 571