DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Details) (USD $)	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES
Total outstanding notional amount of cash flow hedges	$ 140,500,000
Amount to be reclassified from AOCI to interest expense in next 12 months	3,800,000
Derivatives designated as hedging instruments
Derivative instruments and hedging activities
Hedge ineffectiveness recognized	0
Fair Value, liability derivatives	5,701,000	11,142,000
Interest Rate Swaps | Derivatives designated as hedging instruments
Derivative instruments and hedging activities
Fair Value, liability derivatives	$ 5,701,000	$ 11,142,000