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ACCOUNTING POLICIES (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
7.875% senior secured notes [Member]
Jun. 30, 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 $ 544,100,000   $ 544,100,000        
Convertible Debt 60,200,000   60,200,000     60,161,000 112,881,000
Debt Instrument, Fair Value Disclosure 579,500,000   579,500,000        
Common Stock, Dividends, Per Share, Declared $ 0.005 $ 0.005 $ 0.01 $ 0.01      
Interest paid 800,000 300,000 16,375,000 11,856,000      
Income taxes paid $ 27,200,000 $ 37,000,000 $ 37,207,000 $ 46,944,000