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Derivative (Details) - Other liabilities-non current [Member] - Derivatives qualifying as hedges [Member] - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Derivatives, Fair Value [Line Items]    
Notional Amount of Interest Rate Derivatives $ 30,206 $ 34,090
Derivative Liability, Fair Value, Net $ (669) $ (170)