DEBT (Details Tables) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 1.25% Convertible Senior Notes due March 2015 [Member]	Dec. 31, 2013 1.25% Convertible Senior Notes due March 2015 [Member]	Mar. 31, 2010 1.25% Convertible Senior Notes due March 2015 [Member]	Mar. 31, 2014 1.00% Convertible Senior Notes Due March 2018 [Member]	Dec. 31, 2013 1.00% Convertible Senior Notes Due March 2018 [Member]	Mar. 31, 2012 1.00% Convertible Senior Notes Due March 2018 [Member]	Mar. 31, 2014 0.35 % Senior Convertible Notes Due June 2020 [Member]	Dec. 31, 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	$ 2,102,025	$ 2,160,464	$ 102,025	$ 160,464		$ 1,000,000	$ 1,000,000		$ 1,000,000	$ 1,000,000
Unamortized Debt Discount	(251,158)	(266,486)	(4,318)	(8,533)		(91,377)	(96,797)		(155,463)	(161,156)	(20,000)
Carrying Value	$ 1,850,867	$ 1,893,978	$ 97,707	$ 151,931		$ 908,623	$ 903,203		$ 844,537	$ 838,844
Interest rate on Convertible Senior Notes					1.25%			1.00%			0.35%