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ACCOUNTING POLICIES (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
7.875% senior secured notes [Member]
Mar. 31, 2013
5.625% convertible senior subordinated notes [Member]
Dec. 31, 2012
5.625% convertible senior subordinated notes [Member]
Organization And Accounting Policies [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage     7.875% 5.625%  
Senior Notes $ 545,100,000        
Convertible Debt 60,200,000     60,161,000 112,881,000
Debt Instrument, Fair Value Disclosure 586,900,000        
Convertible Debt, Fair Value Disclosures 134,700,000        
Common Stock, Dividends, Per Share, Declared $ 0.005 $ 0.005      
Interest paid 15,535,000 11,600,000      
Income taxes paid $ 10,003,000 $ 9,986,000