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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