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Derivative Financial Instruments - Derivatives Not Designated as Hedging Relationships (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Other Income (Expense) [Member] |  |  |
Derivative Instruments Not Designated as Hedging Instruments [Abstract] |  |  |
Gain (Loss) on foreign currency derivative instruments | $ 3,448 | $ (6,281) | $ 537
Interest Rate Cap [Member] | Interest Expense [Member] |  |  |
Derivative Instruments Not Designated as Hedging Instruments [Abstract] |  |  |
Gain (loss) on interest rate derivative instruments | $ 377 | $ (274) | $ 129

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