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Derivative (Details 2) - Derivatives qualifying as hedges [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion $ 0 $ 11 $ (89) $ (37)
Interest Expense [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion $ 21 $ 8 $ 43 $ 31