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DEBT (Details Tables) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Sep. 30, 2012
1.25% Convertible Senior Notes due March 2015 [Member]
Dec. 31, 2011
1.25% Convertible Senior Notes due March 2015 [Member]
Mar. 31, 2010
1.25% Convertible Senior Notes due March 2015 [Member]
Sep. 30, 2012
1.00% Convertible Senior Notes Due March 2018 [Member]
Mar. 31, 2012
1.00% Convertible Senior Notes Due March 2018 [Member]
Convertible Debt            
Outstanding Principal Amount $ 1,574,999 $ 574,999 $ 575,000   $ 1,000,000  
Unamortized Debt Discount (183,648) (60,457) (77,360)   (123,191)  
Carrying value $ 1,391,351 $ 514,542 $ 497,640   $ 876,809  
Interest rate on Convertible Senior Notes       1.25% 1.00% 1.00%