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LONG-TERM DEBT AND OTHER FINANCING ARRANGEMENTS Convertible Notes (Details) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Oct. 31, 2010
2013 Convertible Notes [Member]
Dec. 31, 2012
2013 Convertible Notes [Member]
Apr. 30, 2012
2013 Convertible Notes [Member]
Dec. 31, 2011
2013 Convertible Notes [Member]
Mar. 31, 2008
2013 Convertible Notes [Member]
Mar. 10, 2008
2013 Convertible Notes [Member]
Dec. 31, 2011
2013 Convertible Notes [Member]
Capped Purchase Call Option [Member]
Sep. 30, 2011
Repurchase of 2013 Convertible Notes [Member] [Member]
Dec. 31, 2012
Repurchase of 2013 Convertible Notes [Member] [Member]
Dec. 31, 2011
Refinance of 2013 Convertible Notes [Member]
Dec. 31, 2012
2015 Convertible Notes [Member]
Dec. 31, 2011
2015 Convertible Notes [Member]
Feb. 18, 2011
2015 Convertible Notes [Member]
Dec. 31, 2012
2015 Convertible Notes [Member]
Common Class A [Member]
Apr. 30, 2012
T W Loan 2013 Convert Note tranche [Member]
Debt Instrument [Line Items]                                    
Debt Instrument, Face Amount           $ 20,647,000 $ 129,660,000 $ 475,000,000         $ 261,000,000 $ 261,034,000 $ 261,034,000     $ 129,700,000
Debt Instrument, Interest Rate, Stated Percentage                 3.50%             5.00%    
Early Repayment of Senior Debt 290,135,000 73,560,000 101,473,000 30,700,000             47,400,000 109,000,000            
Debt Issuance Redemption Cash Consideration                         35,400,000          
Debt Issuance Redemption Cash Consideration Recieved Portion Related To Accrued Interest                         3,300,000          
Extinguishment of Debt, Amount       34,800,000             49,500,000 109,000,000            
Reclassification Of Capped Call Options 0 0               21,100,000                
Debt Instrument, Convertible, Effective Interest Rate         10.30%                 10.00%        
Debt Instrument, Convertible, Number of Equity Instruments                                 20  
Debt Instrument Convertible Principle Amount                                 $ 1,000  
Debt Instrument, Convertible, Conversion Price                                 $ 50  
Beneficial Ownership Interest Total Voting Power Percentage 35.00%                         50.00%