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Derivative Instruments (Details) - Cash Flow Hedging - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Effects of derivative instruments    
Amount of loss recognized in the income statement as an increase in interest expense $ 117 $ 517
Interest rate contracts | Interest expense Member    
Effects of derivative instruments    
Amount of loss recognized in the income statement as an increase in interest expense $ 117 $ 517