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Derivative Instruments (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Interest Rate Derivatives [Abstract]          
Number of interest rate swap contracts 3   3    
aggregate notional amount $ 97,600   $ 97,600   $ 98,900
Termination value of interest rate swap, including accrued interest 3,700   3,700    
Interest Rate Cash Flow Hedges [Abstract]          
Fair value of interest rate swaps 3,700   3,700   $ 4,900
Amount estimated to be reclassified from accumulated other comprehensive income as an increase to interest expense 200   200    
Interest Rate Swap [Member] | Other Comprehensive Income (Loss) [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Amount of loss related to the effective portion recognized in other comprehensive loss (163) $ (700) (25) $ (2,343)  
Interest Rate Swap [Member] | Interest Expense [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Amount of loss related to the effective portion subsequently reclassified to interest expense (129) (276) (316) (559)  
Amount of (loss) gain related to the ineffective portion recognized in interest expense $ (9) $ (22) $ 14 $ (78)