Quarterly report pursuant to Section 13 or 15(d)

LONG-TERM DEBT (Debt Additions and Repayments) (Details)

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LONG-TERM DEBT (Debt Additions and Repayments) (Details) (USD $)
 1 Months Ended 1 Months Ended
Sep. 30, 2014
Sep. 30, 2014
2.5% Convertible Senior Notes Due 2019 [Member]
May 31, 2014
2.5% Convertible Senior Notes Due 2019 [Member]
Sep. 30, 2014
5.375% Senior Notes due 2022 [Member]
May 31, 2014
5.375% Senior Notes due 2022 [Member]
May 31, 2014
5.375% Senior Notes & 2.5% Convertible Senior Notes [Member]
Sep. 30, 2014
2.875% Convertible Senior Notes Due 2027 [Member]
Jul. 31, 2014
2.875% Convertible Senior Notes Due 2027 [Member]
Dec. 31, 2013
2.875% Convertible Senior Notes Due 2027 [Member]
Debt Instrument [Line Items]                  
Face amount   $ 275,000,000 $ 275,000,000   $ 250,000,000        
Interest rate, stated percentage   2.50% 2.50% 5.375% 5.375%   2.875% 2.875% 2.875%
Related fees and expenses           9,900,000      
Extinguishment of debt             220,000,000 29,300,000  
Payment of accrued interest             1,100,000    
Related fees & expenses, debt extinguishment             200,000    
Cash available for general corporate purposes $ 293,800,000