DEBT (Fair Value Hedges) (Details) (USD $) In Thousands, unless otherwise specified			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 5.45% Senior Notes Due 2015 [Member]	Dec. 31, 2012 3.20% Senior Notes Due 2016 [Member]	Dec. 31, 2012 4.75% Senior Notes due January 2020 [Member]	Dec. 31, 2012 4.70% Senior Notes Due 2021 [Member]	Dec. 31, 2012 Interest Rate Swaps [Member] 5.45% Senior Notes Due 2015 [Member]	Dec. 31, 2011 Interest Rate Swaps [Member] 5.45% Senior Notes Due 2015 [Member]	Dec. 31, 2012 Interest Rate Swaps [Member] 3.20% Senior Notes Due 2016 [Member]	Dec. 31, 2011 Interest Rate Swaps [Member] 3.20% Senior Notes Due 2016 [Member]	Dec. 31, 2012 Interest Rate Swaps [Member] 4.75% Senior Notes due January 2020 [Member]	Dec. 31, 2011 Interest Rate Swaps [Member] 4.75% Senior Notes due January 2020 [Member]	Dec. 31, 2012 Interest Rate Swaps [Member] 4.70% Senior Notes Due 2021 [Member]	Dec. 31, 2011 Interest Rate Swaps [Member] 4.70% Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Notional amount of interest rate fair value hedge derivatives							$ 200,000		$ 200,000		$ 350,000		$ 200,000
Debt Instrument, fair value basis adjustment attributable to hedged debt	$ 58,055	$ 56,520					$ (376)	$ 0	$ 11,659	$ 10,858	$ 48,912	$ 45,662	$ (2,140)
Debt instrument, interest rate			5.45%	3.20%	4.75%	4.70%
Debt instrument, maturity date			Nov. 01, 2015	Apr. 01, 2016	Jan. 30, 2020	Apr. 01, 2021