Derivatives (Details 6) - Forward Currency Contract - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Not designated as hedging
Derivatives, Fair Value [Line Items]
Derivative Asset	$ (112)	$ 0
Derivative Liability	(2,530)	(3,133)
Not designated as hedging | Other Long-term Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	(2,530)	(3,133)
Not designated as hedging | Short-term Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	(112)	0
Designated as hedging instrument | Other Long-term Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	0	(191)
Designated as hedging instrument | Other Short-tem Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	$ 0	$ (191)