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SUBSEQUENT EVENTS (Details) (USD $)
Share data in Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Subsequent Event [Line Items]          
Debt Conversion, Converted Instrument, Shares Issued 4.9     6.6  
Induced Conversion of Convertible Debt Expense   $ 16,100,000 $ 0 $ 16,135,000 $ 0
5.625% convertible senior subordinated notes [Member]
         
Subsequent Event [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage     5.625% 5.625%  
Debt Conversion, Original Debt, Amount 52,700,000     59,600,000  
Debt Extinguishment Costs, Early Tender Premium 14,200,000        
Induced Conversion of Convertible Debt Expense 7,300,000   $ 0 $ (16,135,000) $ 0