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RISK MANAGEMENT AND USE OF FINANCIAL INSTRUMENTS (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Derivative financial instruments    
Unrealized losses reclassified from accumulated other comprehensive loss $ 3,500  
Amount estimated to be reclassified as an increase to interest expense 2,500  
Designated | Cash flow    
Derivative financial instruments    
Notional Amount 300,000 $ 400,000
Fair Value $ (3,693) (5,445)
Maximum number of days outstanding to have the option to borrow at the LIBOR 30 days  
Designated | Cash flow | Hedge Product, Swap one    
Derivative financial instruments    
Notional Amount   40,000
Swap, Strike rate (as a percent) 1.8025%  
Fair Value   (243)
Designated | Cash flow | Hedge Product, Swap two    
Derivative financial instruments    
Notional Amount   40,000
Swap, Strike rate (as a percent) 1.8025%  
Fair Value   (243)
Designated | Cash flow | Hedge Product, Swap three    
Derivative financial instruments    
Notional Amount   20,000
Swap, Strike rate (as a percent) 1.8025%  
Fair Value   (122)
Designated | Cash flow | Hedge Product, Swap four    
Derivative financial instruments    
Notional Amount $ 75,000 75,000
Swap, Strike rate (as a percent) 1.336%  
Fair Value $ (273) (540)
Designated | Cash flow | Hedge Product, Swap five    
Derivative financial instruments    
Notional Amount $ 50,000 50,000
Swap, Strike rate (as a percent) 1.336%  
Fair Value $ (182) (360)
Designated | Cash flow | Hedge Product, Swap six    
Derivative financial instruments    
Notional Amount $ 50,000 50,000
Swap, Strike rate (as a percent) 1.336%  
Fair Value $ (182) (360)
Designated | Cash flow | Hedge Product, Swap seven    
Derivative financial instruments    
Notional Amount $ 25,000 25,000
Swap, Strike rate (as a percent) 1.3375%  
Fair Value $ (91) (180)
Designated | Cash flow | Hedge Product, Swap eight    
Derivative financial instruments    
Notional Amount $ 40,000 40,000
Swap, Strike rate (as a percent) 2.459%  
Fair Value $ (1,180) (1,350)
Designated | Cash flow | Hedge Product, Swap nine    
Derivative financial instruments    
Notional Amount $ 40,000 40,000
Swap, Strike rate (as a percent) 2.4725%  
Fair Value $ (1,189) (1,364)
Designated | Cash flow | Hedge Product, Swap ten    
Derivative financial instruments    
Notional Amount $ 20,000 20,000
Swap, Strike rate (as a percent) 2.475%  
Fair Value $ (596) $ (683)