Annual report pursuant to Section 13 and 15(d)

Interest Rate Derivatives (Details)

v3.10.0.1
Interest Rate Derivatives (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivatives in Hedging Relationships      
Amount of (Loss) Gain Recognized in AOCI on Derivatives $ (2,373) $ 684 $ (2,915)
Interest rate swaps | Interest expense [Member]      
Derivatives in Hedging Relationships      
Amount of Gain (Loss) Reclassified from AOCI into Interest Expense on Statement of Operations 407 (3,304) $ (4,230)
Interest rate swaps | Interest rate derivatives [Member]      
Fair value of interest rate derivatives and balance sheet classification      
Interest rate swaps designated as cash flow hedges 5,617 3,073  
Interest rate swaps | Other liabilities [Member]      
Fair value of interest rate derivatives and balance sheet classification      
Interest rate swaps designated as cash flow hedges (5,459) 0  
Designated [Member]      
Fair values of interest rate swap derivatives      
Fair value of interest rate swaps 158 3,073  
Designated [Member] | Interest rate swaps      
Derivatives in Hedging Relationships      
Approximate amount of gains to be reclassified from AOCL to interest expense over the next 12 months 2,100    
Fair value of derivative liability 5,500    
Settlement amount of derivative obligation at termination value 5,500    
Designated [Member] | Interest rate swap, effective date September 1, 2015, swap two [Member]      
Fair values of interest rate swap derivatives      
Notional Amount $ 100,000    
Fixed Rate (as a percent) 1.73%    
Fair value of interest rate swaps $ 472 252  
Designated [Member] | Interest rate swap, effective October 13, 2015 [Member]      
Fair values of interest rate swap derivatives      
Notional Amount $ 12,834    
Fixed Rate (as a percent) 1.39%    
Fair value of interest rate swaps $ 239 213  
Notional amount of interest rate derivatives 12,100    
Designated [Member] | Interest rate swap, effective September 1, 2016, swap one [Member]      
Fair values of interest rate swap derivatives      
Notional Amount $ 100,000    
Fixed Rate (as a percent) 1.9013%    
Fair value of interest rate swaps $ 1,968 1,046  
Designated [Member] | Interest rate swap, effective September 1, 2016, swap two [Member]      
Fair values of interest rate swap derivatives      
Notional Amount $ 100,000    
Fixed Rate (as a percent) 1.905%    
Fair value of interest rate swaps $ 1,967 1,051  
Designated [Member] | Interest rate swap, effective September 1, 2016, swap three [Member]      
Fair values of interest rate swap derivatives      
Notional Amount $ 50,000    
Fixed Rate (as a percent) 1.9079%    
Fair value of interest rate swaps $ 971 511  
Designated [Member] | Interest rate swap, effective June 30, 2020, swap one [Member]      
Fair values of interest rate swap derivatives      
Notional Amount $ 75,000    
Fixed Rate (as a percent) 3.176%    
Fair value of interest rate swaps $ (2,676) 0  
Designated [Member] | Interest rate swap, effective June 30, 2020, swap two [Member]      
Fair values of interest rate swap derivatives      
Notional Amount $ 75,000    
Fixed Rate (as a percent) 3.192%    
Fair value of interest rate swaps $ (2,783) $ 0