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Disclosure About Fair Value of Financial Instruments - Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Assets [Abstract] |  |  |  |
Mortgages and notes receivable, at fair value | $ 17,488 | [1] | $ 18,990 | [1]
Marketable securities of non-qualified deferred compensation plan (in prepaid expenses and other assets) | 3,219 |  | 3,149 |
Tax increment financing bond (in prepaid expenses and other assets) | 15,075 |  | 14,788 |
Impaired real estate assets and for-sale residential condominiums |  |  | 12,767 |
Total Assets | 35,782 |  | 49,694 |
Noncontrolling Interests in the Operating Partnership | 124,201 |  | 110,655 |
Liabilities[Abstract] |  |  |  |
Mortgages and notes payable, at fair value | 2,000,039 | [1] | 1,992,937 | [1]
Interest rate swaps (in accounts payable, accrued expenses and other liabilities) | 1,098 |  | 2,202 |
Non-qualified deferred compensation obligation (in accounts payable, accrued expenses and other liabilities) | 3,219 |  | 3,149 |
Financing obligations, at fair value | 20,076 | [1] | 18,866 | [1]
Total Liabilities | 2,024,432 |  | 2,017,154 |
Level 1 [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Mortgages and notes receivable, at fair value | 0 |  | 0 |
Marketable securities of non-qualified deferred compensation plan (in prepaid expenses and other assets) | 3,219 |  | 3,149 |
Tax increment financing bond (in prepaid expenses and other assets) | 0 |  | 0 |
Impaired real estate assets and for-sale residential condominiums |  |  | 0 |
Total Assets | 3,219 |  | 3,149 |
Noncontrolling Interests in the Operating Partnership | 124,201 |  | 110,655 |
Liabilities[Abstract] |  |  |  |
Mortgages and notes payable, at fair value | 0 |  | 0 |
Interest rate swaps (in accounts payable, accrued expenses and other liabilities) | 0 |  | 0 |
Non-qualified deferred compensation obligation (in accounts payable, accrued expenses and other liabilities) | 3,219 |  | 3,149 |
Financing obligations, at fair value | 0 |  | 0 |
Total Liabilities | 3,219 |  | 3,149 |
Level 2 [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Mortgages and notes receivable, at fair value | 17,488 |  | 18,990 |
Marketable securities of non-qualified deferred compensation plan (in prepaid expenses and other assets) | 0 |  | 0 |
Tax increment financing bond (in prepaid expenses and other assets) | 0 |  | 0 |
Impaired real estate assets and for-sale residential condominiums |  |  | 0 |
Total Assets | 17,488 |  | 18,990 |
Noncontrolling Interests in the Operating Partnership |  |  | 0 |
Liabilities[Abstract] |  |  |  |
Mortgages and notes payable, at fair value | 2,000,039 |  | 1,992,937 |
Interest rate swaps (in accounts payable, accrued expenses and other liabilities) | 1,098 |  | 2,202 |
Non-qualified deferred compensation obligation (in accounts payable, accrued expenses and other liabilities) | 0 |  | 0 |
Financing obligations, at fair value | 0 |  | 0 |
Total Liabilities | 2,001,137 |  | 1,995,139 |
Level 3 [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Mortgages and notes receivable, at fair value | 0 |  | 0 |
Marketable securities of non-qualified deferred compensation plan (in prepaid expenses and other assets) | 0 |  | 0 |
Tax increment financing bond (in prepaid expenses and other assets) | 15,075 |  | 14,788 |
Impaired real estate assets and for-sale residential condominiums |  |  | 12,767 |
Total Assets | 15,075 |  | 27,555 |
Noncontrolling Interests in the Operating Partnership |  |  | 0 |
Liabilities[Abstract] |  |  |  |
Mortgages and notes payable, at fair value | 0 |  | 0 |
Interest rate swaps (in accounts payable, accrued expenses and other liabilities) | 0 |  | 0 |
Non-qualified deferred compensation obligation (in accounts payable, accrued expenses and other liabilities) | 0 |  | 0 |
Financing obligations, at fair value | 20,076 |  | 18,866 |
Total Liabilities | $ 20,076 |  | $ 18,866 |
[1] | Amounts carried at historical cost on our Consolidated Balance Sheets at March 31, 2012 and December 31, 2011, respectively.

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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 the fair value of obligations incurred as part of real estate transactions that are, in substance, a financing arrangement rather than a sale. + References No definition available. + Details
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- Definition Represents the portion of the balance sheet assertion valued at fair value by the entity in connection with the fair value disclosures required in the footnotes to the financial statements. This item represents impaired real estate assets recorded at fair value on a non-recurring basis as a result of quarterly impairment analysis. + References No definition available. + Details
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- Definition Represents the portion of the balance sheet assertion valued at fair value by the entity in connection with the fair value disclosures required in the footnotes to the financial statements. This item represents assets held under deferred compensation agreements. + References No definition available. + Details
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- Definition Represents the portion of the balance sheet assertion valued at fair value by the entity in connection with the fair value disclosures required in the footnotes to the financial statements. This item represents issued and outstanding stock which is not included within permanent equity in Stockholders Equity. + References No definition available. + Details
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- Definition Represents the portion of the balance sheet assertion valued at fair value by the entity in connection with the fair value disclosures required in the footnotes to the financial statements. This item represents currently earned compensation under compensation arrangements that is not actually paid until a later date. + References No definition available. + Details
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- Definition Represents the portion of the balance sheet assertion valued at fair value by the entity in connection with the fair value disclosures required in the footnotes to the financial statements. This item represents tax increment financing bonds. + References No definition available. + Details
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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition Derivative instrument obligations meeting the definition of a liability which the Company is a party to 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 133 -Paragraph 10 -Subparagraph i -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 Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 6 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 15 -Paragraph 83 -URI http://asc.fasb.org/extlink&oid=6913464&loc=d3e34841-113949 + 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. Fair value of Loans Payable at the balance sheet date. + References No definition available. + Details
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