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DEBT (Details Tables) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2013
1.25% Convertible Senior Notes due March 2015 [Member]
Dec. 31, 2012
1.25% Convertible Senior Notes due March 2015 [Member]
Mar. 31, 2010
1.25% Convertible Senior Notes due March 2015 [Member]
Sep. 30, 2013
1.00% Convertible Senior Notes Due March 2018 [Member]
Dec. 31, 2012
1.00% Convertible Senior Notes Due March 2018 [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]
Sep. 30, 2013
0.35 % Senior Convertible Notes Due June 2020 [Member]
May 31, 2013
0.35 % Senior Convertible Notes Due June 2020 [Member]
Convertible Debt                      
Outstanding Principal Amount $ 2,574,996 $ 1,574,999 $ 574,996 $ 574,999   $ 1,000,000 $ 1,000,000     $ 1,000,000  
Unamortized debt discount (305,703) (172,659) (36,730) (54,655)   (102,168) (118,004)     (166,805) (20,000)
Carrying value $ 2,269,293 $ 1,402,340 $ 538,266 $ 520,344   $ 897,832 $ 881,996     $ 833,195  
Interest rate on Convertible Senior Notes         1.25%     1.00% 1.00% 0.35% 0.35%