DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Details) (USD $)	Jun. 30, 2012	Dec. 31, 2011
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	4,000,000
Derivative instruments and hedging activities
Fair Value, liability derivatives	11,037,000	11,337,000
Interest rate swaps | Derivatives designated as hedging instruments
Derivative instruments and hedging activities
Fair Value, liability derivatives	$ 11,037,000	$ 11,337,000