Indebtedness (Schedule Of Debt Maturities) (Details) (USD $)	22 Months Ended
	Dec. 31, 2011
Debt Instrument [Line Items]
December 31, 2012	$ 10,743,000	[1]
March 31, 2013	724,000	[1]
March 31, 2014	596,100,000	[1]
March 31, 2015	400,472,000	[1]
March 31, 2016	250,178,000	[1]
Thereafter	506,897,000	[1]
Total maturities of long-term debt	1,765,114,000	[1]
Discounts	1,000,000
2.85% Senior Notes Maturing October 2013 [Member]
Debt Instrument [Line Items]
Additional carrying value related to fair value hedges	$ 6,700,000

[1] Outstanding borrowings under the Securitization Agreement at December 31, 2011 are reflected as maturing at the agreement’s expiration in December 2013.The Senior Notes are reflected in the debt maturity schedule at their maturity values rather than their carrying values, which are net of aggregate discounts of $1.0 million at December 31, 2011. The 2013 Notes also include additional carrying value of $6.7 million at December 31, 2011 related to the Company’s fair value hedges — see Note 8 for additional disclosure.