Derivatives - Fair Value of Derivative Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Designated as hedging instrument | Interest rate swap | Other assets (long-term)
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	$ 1,201	$ 5,772
Designated as hedging instrument | Foreign currency forward contract | Other assets (long-term)
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	496	151
Designated as hedging instrument | Foreign currency forward contract | Prepaid expenses and other assets
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	1,821	613
Designated as hedging instrument | Foreign currency forward contract | Accrued expenses
Derivatives, Fair Value [Line Items]
Total Liability Derivatives	(1,262)	(711)
Designated as hedging instrument | Foreign currency forward contract | Other long-term obligations
Derivatives, Fair Value [Line Items]
Total Liability Derivatives	(333)	(101)
Not designated as hedging instrument | Foreign currency forward contract | Prepaid expenses and other assets
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	541	814
Not designated as hedging instrument | Foreign currency forward contract | Accrued expenses
Derivatives, Fair Value [Line Items]
Total Liability Derivatives	$ (505)	$ (796)