Derivative Financial Instruments - Summary of the Fair Value Amounts of Derivative Instruments (Details) - Recurring - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Total Derivative Assets	$ 3,379	$ 1,087
Total Derivative Liabilities	33	57
Forward Currency Contracts
Derivatives, Fair Value [Line Items]
Total Derivative Assets	186	26
Total Derivative Liabilities	33	57
Interest Rate Swap
Derivatives, Fair Value [Line Items]
Total Derivative Assets	3,193	1,061
Derivatives Designated as Hedging Instruments:
Derivatives, Fair Value [Line Items]
Total Net Derivative Asset (Liability)	3,300
Significant Observable Inputs (Level 2)
Derivatives, Fair Value [Line Items]
Total Derivative Assets	3,379	1,087
Total Derivative Liabilities	33	57
Total Net Derivative Asset (Liability)	3,346	1,030
Significant Observable Inputs (Level 2) | Forward Currency Contracts
Derivatives, Fair Value [Line Items]
Total Derivative Assets	186	26
Total Derivative Liabilities	33	57
Significant Observable Inputs (Level 2) | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Total Derivative Assets	3,193	1,061
Significant Observable Inputs (Level 2) | Derivatives Designated as Hedging Instruments:
Derivatives, Fair Value [Line Items]
Total Derivative Assets	3,369	1,061
Total Derivative Liabilities	33	57
Significant Observable Inputs (Level 2) | Derivatives Designated as Hedging Instruments: | Forward Currency Contracts | Accrued expenses
Derivatives, Fair Value [Line Items]
Total Derivative Liabilities	33	57
Significant Observable Inputs (Level 2) | Derivatives Designated as Hedging Instruments: | Forward Currency Contracts | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Total Derivative Assets	176	0
Significant Observable Inputs (Level 2) | Derivatives Designated as Hedging Instruments: | Interest Rate Swap | Other non-current assets
Derivatives, Fair Value [Line Items]
Total Derivative Assets	3,193	1,061
Significant Observable Inputs (Level 2) | Derivatives Not Designated as Hedging Instruments:
Derivatives, Fair Value [Line Items]
Total Derivative Assets	10	26
Significant Observable Inputs (Level 2) | Derivatives Not Designated as Hedging Instruments: | Forward Currency Contracts | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Total Derivative Assets	$ 10	$ 26