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Fair Value Disclosures (Fair Value Of Notes Receivable And Notes Payable) (Details) (USD $) | 9 Months Ended |  |  | 3 Months Ended |  | 1 Months Ended |  |  |  |  |  |
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Sep. 30, 2011 | Jun. 30, 2011 | Dec. 31, 2010 | Jun. 30, 2011 Commercial Banks [Member] Term Loan, Due 2012 [Member] | Dec. 31, 2010 Term Loan [Member] | Jul. 31, 2011 Construction Loan [Member] | Sep. 30, 2011 Construction Loan [Member] | Dec. 31, 2010 Construction Loan [Member] | Sep. 30, 2011 Fixed Rate Notes Payable [Member] | Dec. 31, 2010 Fixed Rate Notes Payable [Member] | Sep. 30, 2011 Floating Rate Notes Payable [Member] | Dec. 31, 2010 Floating Rate Notes Payable [Member]
Notes receivable - affiliates, Carrying Value |  |  | $ 3,194,000 |  |  |  |  |  |  |  |  |  |  |
Notes receivable - affiliates, Estimated Fair Value |  |  | 3,200,000 |  |  |  |  |  |  |  |  |  |  |
Carrying Value | 2,433,100,000 |  | 2,563,800,000 |  |  |  |  |  | 2,187,200,000 | [1] | 2,333,500,000 | [1] | 245,900,000 | 230,300,000
Estimated Fair Value |  |  |  |  |  |  |  |  | 2,276,400,000 | [1] | 2,386,000,000 | [1] | 234,300,000 | 212,700,000
Fixed rate notes payable |  |  |  |  | 500,000,000 |  | 16,600,000 | 16,600,000 |  |  |  |  |  |
Aggregate face amount of debt offerings completed during the period |  | 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Construction loan extension date |  |  |  |  |  | July 2011 |  |  |  |  |  |  |  |
Repayment of senior unsecured notes | $ 500,000,000 |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |
[1] | December 31, 2010 includes a $500 million term loan entered into in 2007, and a $16.6 million construction loan entered into in 2008 which are effectively fixed by the use of interest rate swaps but evaluated for estimated fair value at the floating rate. The $500 million term loan was repaid in June 2011 from the net proceeds received from our $500 million debt offerings also completed in June 2011 and with cash on hand. The $16.6 million construction loan interest rate swap matured and was not extended in conjunction with the one-year extension of the loan in July 2011.

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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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