Derivative Instruments - Balance Sheet Location (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Net amount of assets presented	$ 44	$ 450
Net amount of liabilities presented	11	244
Designated as Hedging Instrument [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Net amount of assets presented	43	441
Designated as Hedging Instrument [Member] | Accrued Expenses [Member]
Derivatives, Fair Value [Line Items]
Net amount of liabilities presented	0	201
Not Designated as Hedging Instrument [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Net amount of assets presented	1	9
Not Designated as Hedging Instrument [Member] | Accrued Expenses [Member]
Derivatives, Fair Value [Line Items]
Net amount of liabilities presented	$ 11	$ 43