DEBT (Details 4) (USD $)	12 Months Ended						1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Convertible Notes	Dec. 31, 2011 Convertible Notes	Dec. 31, 2010 Convertible Notes	Mar. 31, 2010 1.25% Convertible Senior Notes Due March 2015 [Member] Days	Dec. 31, 2010 1.25% Convertible Senior Notes Due March 2015 [Member]	Mar. 31, 2012 1.00% Convertible Senior Notes Due March 2018 [Member] Days	Dec. 31, 2012 1.00% Convertible Senior Notes Due March 2018 [Member]	Dec. 31, 2010 Convertible Debt Converted Debt [Member]
Debt Instrument
Estimated market value of outstanding senior notes	$ 2,300,000,000	$ 900,000,000
Debt Instrument Conversion Terms
Aggregate principal amount							575,000,000		1,000,000,000
Interest expense related to convertible notes				59,400,000	30,600,000	27,600,000
Debt financing costs paid								13,300,000		20,900,000
Debt Instrument, Convertible, Conversion Price							$ 303.06		$ 944.61
Gain (loss) on extinguishment of debt, pretax	0	(32,000)	(11,334,000)			(11,300,000)
Gain (loss) on extinguishment of debt, net of tax						(6,800,000)
Interest rate on Convertible Senior Notes (as a percent)							1.25%		1.00%
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 (as a percent)							150.00%		150.00%
Effective interest rate at debt origination or modification (as a percent)							5.89%		3.50%
Effective interest rate during the period (as a percent)				4.80%	6.30%	6.70%
Debt discount related to convertible notes, net of tax							69,100,000		80,900,000
Debt discount related to convertible notes, before tax							115,200,000		135,200,000
Finance costs related to convertible notes, net of tax							1,600,000		2,800,000
Contractual coupon interest related to convertible notes included in interest expense				15,200,000	7,200,000	5,800,000
Amortization of debt discount included in interest expense	39,820,000	21,414,000	20,110,000	39,800,000	21,400,000	20,100,000
Amortization of debt issuance costs included in interest expense				4,400,000	2,000,000	1,700,000
Write off of Deferred Debt Issuance Cost											$ 1,400,000