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Derivative and Hedging Instruments - Balance Sheet Classification (Details) - Designated as Hedging Instrument - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Derivative [Line Items]    
Derivative liability, fair value $ (1,661) $ (833)
Interest Rate Contracts    
Derivative [Line Items]    
Derivative liability, fair value $ (1,661) $ (833)