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RISK MANAGEMENT AND USE OF FINANCIAL INSTRUMENTS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Derivative financial instruments    
Unrealized losses reclassified from accumulated other comprehensive loss $ 1,700  
Amount estimated to be reclassified as an increase to interest expense 400  
Designated | Cash flow    
Derivative financial instruments    
Notional Amount 100,000 $ 300,000
Fair Value $ (406) (2,280)
Maximum number of days outstanding to have the option to borrow at the LIBOR 30 days  
Designated | Cash flow | Hedge Product, Swap four    
Derivative financial instruments    
Notional Amount   $ 75,000
Swap, Strike rate (as a percent)   1.336%
Fair Value   $ (103)
Designated | Cash flow | Hedge Product, Swap five    
Derivative financial instruments    
Notional Amount   $ 50,000
Swap, Strike rate (as a percent)   1.336%
Fair Value   $ (69)
Designated | Cash flow | Hedge Product, Swap six    
Derivative financial instruments    
Notional Amount   $ 50,000
Swap, Strike rate (as a percent)   1.336%
Fair Value   $ (69)
Designated | Cash flow | Hedge Product, Swap seven    
Derivative financial instruments    
Notional Amount   $ 25,000
Swap, Strike rate (as a percent)   1.3375%
Fair Value   $ (34)
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 (161) $ (797)
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 (163) $ (804)
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 $ (82) $ (404)