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Derivative Instruments and Hedging Activity (Details 2) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Derivative Instruments, Amount of Income/(Loss) Recognized in OCI on Derivative (Effective Portion) $ 792 $ (411) $ 2,712 $ 330
Derivative Instruments, Amount of Income/(Loss) Reclassified from Accumulated OCI into Expense (Effective Portion) $ (4) $ (435) $ (91) $ (900)