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Derivatives (Fair Value of the Company's Other Derivatives) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | --- | ---
Not Designated as Hedging Instrument | Other long term liabilities | Interest rate contracts |  |  |
Derivative [Line Items] |  |  |
Derivative liabilities | $ (1,261) | $ (353) | $ 193
Not Designated as Hedging Instrument | Accrued expenses and other current liabilities | Foreign currency contract |  |  |
Derivative [Line Items] |  |  |
Derivative liabilities | 115 | (1,122) | (737)
Designated as Hedging Instrument | Accrued expenses and other current liabilities | Interest rate contracts |  |  |
Derivative [Line Items] |  |  |
Derivative liabilities | (2,981) | 0 | 0
Designated as Hedging Instrument | Other assets | Interest rate contracts |  |  |
Derivative [Line Items] |  |  |
Derivative assets | $ (13,649) | $ (168) | $ 227

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