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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES(Details)
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
item
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
item
Sep. 30, 2014
USD ($)
Nov. 02, 2015
USD ($)
Cash flow hedges          
DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES          
Amount of gain (loss) expected to be reclassified from AOCI to earnings during the next twelve months     $ 4,835,000    
Unsecured term loans          
DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES          
Amount of financing         $ 385,000,000
Forward-starting interest rate swap | Cash flow hedges          
DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES          
Number of interest rate swaps | item 10   10    
Derivatives, notional amount $ 385,000,000   $ 385,000,000    
Amount of gain (loss), gross of tax, on financial instruments qualifying for hedge accounting included in OCI (6,312,000)   (6,312,000)    
Amount of gain (loss), gross of tax, reclassified from AOCI into Income $ 0 $ 0 $ 0 $ 0  
Forward-starting interest rate swap | Minimum | Cash flow hedges          
DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES          
Weighted average rate (as a percent) 1.559%   1.559%    
Forward-starting interest rate swap | Maximum | Cash flow hedges          
DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES          
Weighted average rate (as a percent) 1.5689%   1.5689%    
Forward-starting interest rate swap | Weighted Average | Cash flow hedges          
DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES          
Weighted average rate (as a percent) 1.563%   1.563%    
Credit spread rate (as a percent) 1.60%   1.60%    
All-in rate (as a percent) 3.163%   3.163%