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Fair Value Measurements (Fair Value Of Notes Receivable And Notes Payable) (Details) (USD $) | 12 Months Ended |  | 1 Months Ended |  |  |  |  |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2010 Term Loan [Member] | Jul. 31, 2011 Construction Loan [Member] | Dec. 31, 2010 Construction Loan [Member] | Dec. 31, 2011 Fixed Rate Notes Payable [Member] | Dec. 31, 2010 Fixed Rate Notes Payable [Member] | Dec. 31, 2011 Floating Rate Notes Payable [Member] | Dec. 31, 2010 Floating Rate Notes Payable [Member] | Jun. 30, 2011 Commercial Banks [Member] Term Loan, Due 2012 [Member]
Fair Value Of Notes Receivable And Notes Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable - affiliates, Carrying Value |  | $ 3,194,000 |  |  |  |  |  |  |  |  |  |
Notes receivable - affiliates, Estimated Fair Value |  | 3,200,000 |  |  |  |  |  |  |  |  |  |
Carrying Value | 2,432,100,000 | 2,563,800,000 |  |  |  | 2,186,600,000 | [1] | 2,333,500,000 | [1] | 245,500,000 | 230,300,000 |
Estimated Fair Value |  |  |  |  |  | 2,304,400,000 | [1] | 2,386,000,000 | [1] | 233,600,000 | 212,700,000 |
Fixed rate notes payable |  |  | 500,000,000 |  | 16,600,000 |  |  |  |  |  |  |
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. 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 Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13, 16 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents notes payable as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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