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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Details) (USD $)
 1 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Derivatives designated as hedging instruments
Dec. 31, 2011
Derivatives designated as hedging instruments
Aug. 31, 2012
Interest rate swaps
Derivatives designated as hedging instruments
Item
Dec. 31, 2012
Interest rate swaps
Derivatives designated as hedging instruments
Dec. 31, 2011
Interest rate swaps
Derivatives designated as hedging instruments
Dec. 31, 2012
Interest rate swaps effective on September 20, 2014
Derivatives designated as hedging instruments
Dec. 31, 2012
Interest rate swaps effective on June 30, 2017
Derivatives designated as hedging instruments
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES                
Total outstanding notional amount of cash flow hedges $ 143,000,000              
Amount to be reclassified from AOCI to interest expense in next 12 months 4,100,000              
Derivative instruments and hedging activities                
Additional forward-starting interest rate swaps       2        
Notional amount of interest rate cash flow hedge derivative acquired             20,000,000 100,000,000
Expanded notional amount of interest rate cash flow hedge derivative             130,000,000  
Fair Value, liability derivatives   $ 11,142,000 $ 11,337,000   $ 11,142,000 $ 11,337,000