DEBT (2011 Senior Notes Offering) (Details) (USD $)					12 Months Ended							0 Months Ended	12 Months Ended						12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Floating Rate Senior Notes due 2014 [Member]	Dec. 31, 2012 3.20% Senior Notes Due 2016 [Member]	Dec. 31, 2012 4.70% Senior Notes Due 2021 [Member]	Dec. 31, 2012 5.75% Senior Notes Due 2040 [Member]	Dec. 31, 2012 Senior Notes Due 2020 [Member]	Dec. 31, 2012 March 2011 Senior Notes [Member]	Mar. 24, 2011 March 2011 Senior Notes [Member]	Mar. 24, 2011 March 2011 Senior Notes [Member] Floating Rate Senior Notes due 2014 [Member]	Dec. 31, 2012 March 2011 Senior Notes [Member] Floating Rate Senior Notes due 2014 [Member]	Dec. 31, 2011 March 2011 Senior Notes [Member] Floating Rate Senior Notes due 2014 [Member]	Mar. 24, 2011 March 2011 Senior Notes [Member] 3.20% Senior Notes Due 2016 [Member]	Mar. 24, 2011 March 2011 Senior Notes [Member] 4.70% Senior Notes Due 2021 [Member]	Mar. 24, 2011 March 2011 Senior Notes [Member] 5.75% Senior Notes Due 2040 [Member]	Nov. 17, 2009 March 2011 Senior Notes [Member] 5.75% Senior Notes Due 2040 [Member]	Dec. 31, 2012 March 2011 Senior Notes [Member] Credit Facilities [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate						3.20%	4.70%	5.75%	4.75%						3.20%	4.70%	5.75%
Debt instrument, maturity date						Apr. 01, 2016	Apr. 01, 2021	Jan. 30, 2040	Jan. 30, 2020
Debt offering amount											$ 1,250,000,000	$ 200,000,000			$ 300,000,000	$ 550,000,000	$ 200,000,000	$ 250,000,000
Debt instrument, description of variable rate basis					three-month LIBOR							three-month LIBOR	three-month LIBOR
Interest rate in excess of LIBOR												0.85%
LIBOR rate													0.31%	0.58%
Use of proceeds from debt issuance										750,000,000									485,000,000
Cash and cash equivalents	$ 295,586,000	$ 164,886,000	$ 449,301,000	$ 534,256,000															$ 90,000,000