Derivatives - Fair Value of Derivative Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Designated as hedging instrument | Interest rate swap
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	$ 4,388
Designated as hedging instrument | Interest rate swap | Other Assets (current)
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	79	$ 0
Designated as hedging instrument | Interest rate swap | Other Assets (long-term)
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	4,309	4,991
Designated as hedging instrument | Foreign currency forward contracts | Other Assets (long-term)
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	158	18
Designated as hedging instrument | Foreign currency forward contracts | Prepaid expenses and other assets
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	646	116
Designated as hedging instrument | Foreign currency forward contracts | Accrued expenses (current)
Derivatives, Fair Value [Line Items]
Total Liability Derivatives	(286)	(275)
Designated as hedging instrument | Foreign currency forward contracts | Other Long-term Obligations
Derivatives, Fair Value [Line Items]
Total Liability Derivatives	(96)	(18)
Not designated as hedging instrument | Foreign currency forward contracts | Prepaid expenses and other assets
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	485	220
Not designated as hedging instrument | Foreign currency forward contracts | Accrued expenses (current)
Derivatives, Fair Value [Line Items]
Total Liability Derivatives	$ (210)	$ (171)