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ACCOUNTING POLICIES (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Oct. 07, 2013
Sep. 30, 2013
7.875% senior secured notes [Member]
Sep. 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         6.875% 7.875% 5.625%  
Senior Notes $ 543,100,000   $ 543,100,000   $ 400,000,000      
Convertible Debt 60,200,000   60,200,000       60,161,000 112,881,000
Debt Instrument, Fair Value Disclosure 577,100,000   577,100,000          
Common Stock, Dividends, Per Share, Declared $ 0.005 $ 0.005 $ 0.015 $ 0.015        
Interest paid 2,100,000 3,500,000 18,484,000 15,330,000        
Income taxes paid $ 18,500,000 $ 16,700,000 $ 56,523,000 $ 63,669,000