DEBT (Details 2) (USD $)	9 Months Ended		3 Months Ended		9 Months Ended			1 Months Ended	9 Months Ended	1 Months Ended	9 Months Ended	12 Months Ended		1 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Convertible Notes	Sep. 30, 2011 Convertible Notes	Sep. 30, 2012 Convertible Notes	Sep. 30, 2011 Convertible Notes	Dec. 31, 2011 Convertible Notes	Mar. 31, 2012 1.00% Convertible Senior Notes Due March 2018 [Member] Days	Sep. 30, 2012 1.00% Convertible Senior Notes Due March 2018 [Member]	Mar. 31, 2010 1.25% Convertible Senior Notes due March 2015 [Member] Days	Sep. 30, 2012 1.25% Convertible Senior Notes due March 2015 [Member]	Dec. 31, 2011 1.25% Convertible Senior Notes due March 2015 [Member]	Dec. 31, 2010 1.25% Convertible Senior Notes due March 2015 [Member]	Mar. 31, 2012 Minimum [Member] 1.00% Convertible Senior Notes Due March 2018 [Member]	Mar. 31, 2010 Minimum [Member] 1.25% Convertible Senior Notes due March 2015 [Member]	Mar. 31, 2012 Maximum [Member] 1.00% Convertible Senior Notes Due March 2018 [Member]	Mar. 31, 2010 Maximum [Member] 1.25% Convertible Senior Notes due March 2015 [Member]
Debt Instrument
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Subsequent Adjustments											$ 60,500,000	$ 77,400,000
Estimated market value of outstanding convertible debt			2,300,000,000		2,300,000,000		900,000,000
Description of Senior Notes
Aggregate principal amount								1,000,000,000	1,000,000,000	575,000,000
Interest rate on Convertible Senior Notes								1.00%	1.00%	1.25%
Debt financing costs paid									20,900,000				13,300,000
Convertible debt conversion price (in dollars per share)								$ 944.61		$ 303.06
Minimum 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		20
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)								30		30
Ratio of closing share price to conversion price as a condition for conversion of convertible 2015 Senior Notes, minimum								150.00%		150.00%
Additional Payment To Debt Holder Settled In Shares Aggregate Value Of Shares														0	0	344,000,000	132,700,000
Effective interest rate at debt origination or modification								3.50%		5.89%
Debt discount related to convertible notes, net of tax								80,900,000
Debt discount related to convertible notes, before tax								135,200,000
Finance costs related to convertible notes, net of tax								2,800,000
Interest expense related to convertible notes			16,400,000	7,700,000	43,200,000	22,800,000
Contractual coupon interest related to convertible notes included in interest expense			4,300,000	1,800,000	11,200,000	5,400,000
Amortization of debt discount included in interest expense	28,831,000	15,944,000	10,900,000	5,400,000	28,800,000	15,900,000
Amortization of debt issuance costs			$ 1,200,000	$ 500,000	$ 3,200,000	$ 1,500,000
Effective interest rate during the period			4.70%	6.30%	4.90%	6.30%