COMMITMENTS AND CONTINGENCIES (Details) (Special Long-Term Retention and Incentive Equity Awards Program, USD $) In Millions, unless otherwise specified	12 Months Ended	6 Months Ended
	Dec. 31, 2011	Jun. 30, 2013 Cash bonus expense
Special Long-Term Retention and Incentive Equity Awards Program
Timeframe for achievement of performance conditions	6 years
Maximum compensation expense to be recognized if sufficient performance conditions are achieved		$ 38.2
Long-term retention program bonus expense recognized during the period		0
Compensation expenses related to cash bonus to be recognized in next fiscal year if sufficient performance conditions are achieved		$ 9.5