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Derivatives and Hedging Activities - Derivatives in Cash Flow Hedging Relationships (Details 2) - Cash flow hedging - Interest rate swaps - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion) $ (471)
Interest expense        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion) (460) (455) (960) (880)
Gain (Loss) Recognized in Income on Derivative (Ineffective Portion) $ (7)