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Derivative Instruments and Hedging Activities - Fair Value of Derivatives (Details) - Derivatives Not Designated as Hedging Instruments - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Prepaid expenses and other    
Fair value of derivative instruments    
Derivative assets $ 93 $ 1,579
Accrued expenses    
Fair value of derivative instruments    
Derivative liabilities $ 0 $ 2,329