DEBT (Details 2) (USD $)	3 Months Ended			3 Months Ended			1 Months Ended	3 Months Ended	12 Months Ended		1 Months Ended	12 Months Ended			1 Months Ended	3 Months Ended	12 Months Ended				1 Months Ended							3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 2014 Convertible Notes [Member]	Mar. 31, 2013 Convertible Notes [Member]	Dec. 31, 2013 Convertible Notes [Member]	Mar. 31, 2010 1.25% Convertible Senior Notes due March 2015 [Member]	Mar. 31, 2014 1.25% Convertible Senior Notes due March 2015 [Member]	Dec. 31, 2013 1.25% Convertible Senior Notes due March 2015 [Member]	Dec. 31, 2010 1.25% Convertible Senior Notes due March 2015 [Member]	Mar. 31, 2012 1.00% Convertible Senior Notes Due March 2018 [Member]	Dec. 31, 2012 1.00% Convertible Senior Notes Due March 2018 [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]	May 31, 2013 0.35 % Senior Convertible Notes Due June 2020 [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]	Jun. 30, 2013 0.35 % Senior Convertible Notes Due June 2020 [Member]	Mar. 31, 2014 Convertible Debt Liability [Member]	Mar. 31, 2013 Convertible Debt Liability [Member]	Mar. 31, 2010 Minimum [Member] 1.25% Convertible Senior Notes due March 2015 [Member]	Mar. 31, 2012 Minimum [Member] 1.00% Convertible Senior Notes Due March 2018 [Member]	May 31, 2013 Minimum [Member] 0.35 % Senior Convertible Notes Due June 2020 [Member]	Mar. 31, 2010 Maximum [Member] 1.25% Convertible Senior Notes due March 2015 [Member]	Mar. 31, 2012 Maximum [Member] 1.00% Convertible Senior Notes Due March 2018 [Member]	May 31, 2013 Maximum [Member] 0.35 % Senior Convertible Notes Due June 2020 [Member]	May 01, 2014 Subsequent Event [Member] 1.25% Convertible Senior Notes due March 2015 [Member]	Mar. 31, 2014 Convertible Debt Converted Debt [Member]
Debt Instrument
Adjustments to Additional Paid-in Capital, Equity Component of Convertible Debt, Subsequent Adjustments								$ (4,300,000)	$ (8,500,000)
Debt Conversion Cash Delivered for Principal Due on Converted Debt								58,400,000
Debt Conversion, Converted Instrument, Shares Issued																												142,896
Extinguishment of Debt, Amount																											59,000,000
Estimated market value of outstanding convertible debt				3,000,000,000		3,100,000,000
Description of Senior Notes
Aggregate principal amount							575,000,000				1,000,000,000				1,000,000,000
Interest rate on Convertible Senior Notes							1.25%				1.00%				0.35%
Unamortized debt discount	251,158,000		266,486,000					4,318,000	8,533,000				91,377,000	96,797,000	20,000,000	155,463,000	161,156,000
Debt financing costs paid										13,300,000		20,900,000					1,000,000
Convertible debt conversion price (in dollars per share)							$ 303.06				$ 944.61				$ 1,315.10
Maximum consecutive days the closing sales price of common stock must exceed a specified percentage of conversion price to trigger conversion feature of note (in days)																					20 days	20 days	20 days	30 days	30 days	30 days
Ratio of closing share price to conversion price as a condition for conversion of convertible 2015 Senior Notes, minimum							150.00%				150.00%				150.00%
Additional Payment To Debt Holder Settled In Shares Aggregate Value Of Shares																						0	0		344,000,000	397,000,000
Debt discount related to convertible notes, net of tax							69,100,000				80,900,000							92,400,000
Debt discount related to convertible notes, before tax							115,200,000				135,200,000							154,300,000
Finance costs related to convertible notes, net of tax							1,600,000				2,800,000							100,000
Interest expense related to convertible notes				17,100,000	16,700,000
Contractual coupon interest related to convertible notes included in interest expense				3,500,000	4,300,000
Amortization of debt discount included in interest expense	12,412,000	11,120,000		12,400,000	11,100,000											700,000
Amortization of debt issuance costs				1,200,000	1,300,000
Write off of deferred debt issuance cost																												300,000
Effective interest rate at debt origination or modification							5.89%				3.50%				3.13%				3.60%	4.70%
Gains (Losses) on Extinguishment of Debt	(3,396,000)	0		(3,396,000)
Extinguishment of Debt, Gain (Loss), Net of Tax				$ (2,100,000)