SENIOR NOTES PAYABLE AND OTHER DEBT (Details 4) (USD $)	9 Months Ended		1 Months Ended		1 Months Ended		1 Months Ended		1 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Feb. 28, 2013 6.25% Senior Notes due 2013	Dec. 31, 2012 6.25% Senior Notes due 2013	Mar. 31, 2013 5.45% Senior Notes due 2043	Sep. 30, 2013 5.45% Senior Notes due 2043	Mar. 31, 2013 2.700% Senior Notes due 2020	Sep. 30, 2013 2.700% Senior Notes due 2020	Sep. 30, 2013 One Point Five Five Percent Senior Notes, Due 2016 [Member]	Mar. 31, 2013 One Point Five Five Percent Senior Notes, Due 2016 [Member]	Sep. 30, 2013 Five Point Seven Zero Percent Senior Notes, Due 2043 [Member]	Mar. 31, 2013 Five Point Seven Zero Percent Senior Notes, Due 2043 [Member]
Debt instruments
Repayments of senior debt			$ 269,900,000
Proceeds from debt	1,766,844,000	1,568,382,000			258,800,000		500,000,000		550,000,000		300,000,000
Interest rate (as a percent)			6.25%	6.25%		5.45%		2.70%	1.55%		5.70%
Public Offering Price as a Percent of Par								99.942%	99.91%		99.628%
Proceeds from issuance of debt					$ 258,800,000		$ 499,700,000			$ 549,500,000		$ 298,900,000