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ACCOUNTING POLICIES (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
7.875% senior secured notes [Member]
Dec. 31, 2011
7.875% senior secured notes [Member]
Jun. 30, 2012
5.625% convertible senior subordinated notes [Member]
Dec. 31, 2011
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 $ 200,000,000   $ 200,000,000   $ 200,000,000 $ 200,000,000    
Convertible Debt 112,900,000   112,900,000       112,881,000 112,881,000
Debt Instrument, Fair Value Disclosure 208,000,000   208,000,000          
Convertible Debt, Fair Value Disclosures 295,400,000   295,400,000          
Common Stock, Dividends, Per Share, Declared $ 0.005 $ 0.005 $ 0.010 $ 0.010        
Interest Paid 300,000 400,000 11,900,000 13,400,000        
Income Taxes Paid $ 37,000,000 $ 10,500,000 $ 46,900,000 $ 10,600,000