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CONVERTIBLE DEBT CONVERSION CHARGE (Details) - USD ($)
$ in Thousands, shares in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Extinguishment of Debt [Line Items]        
Debt Conversion, Converted Instrument, Shares Issued 4.9      
Induced Conversion of Convertible Debt Expense   $ 0 $ 7,273 $ 0
5.625% convertible senior subordinated notes [Member]        
Extinguishment of Debt [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage   5.625%    
Debt Conversion, Original Debt, Amount $ 52,700      
Debt Extinguishment Costs, Early Tender Premium $ 14,200