Investments in Unconsolidated Real Estate Joint Ventures Summary Balance Sheets for Unconsolidated Joint Ventures (Details) (Partnership Interest [Member], USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Partnership Interest [Member]
Summary Balance Sheets of Unconsolidated Joint Ventures [Line Items]
Real Estate Investment Property, at Cost	$ 289,318	$ 283,902
Cash and Cash Equivalents, at Carrying Value	16,141	13,838
Deferred Costs, Leasing, Net	2,840	2,563
Deferred Finance Costs, Net	724	1,427
Prepaid Expense and Other Assets	9,969	6,291
Equity Method Investment, Summarized Financial Information, Assets	318,992	308,021
Mortgage Loans on Real Estate	293,534	294,034
Construction Payable	4,958	341
Accounts Payable and Other Accrued Liabilities	5,378	4,810
Equity Method Investment, Summarized Financial Information, Liabilities	303,870	299,185
Equity Method Investment Summarized Financial Information, Equity	15,122	8,836
Equity Method Investment, Summarized Financial Information, Liabilities and Equity	$ 318,992	$ 308,021

Summary Balance Sheets of Unconsolidated Joint Ventures [Line Items]

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Sum of the carrying values as of the balance sheet date of liabilities incurred and payable to vendors for goods and services received, and other costs not separately disclosed in the balance sheet that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered.

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Carrying value as of the balance sheet date of obligations incurred and payable for the acquisition of merchandise, materials, supplies and services pertaining to construction projects such as a housing development or factory expansion not classified as trade payables.

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This element represents costs incurred by the lessor that are (a) costs to originate a lease incurred in transactions with independent third parties that (i) result directly from and are essential to acquire that lease and (ii) would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction. This element is net of accumulated amortization.

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The amount of assets reported by an equity method investment of the entity.

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The amount of equity (capital), including the noncontrolling interest (if any), reported by an equity method investment of the entity.

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Total carrying amount of mortgage loans as of the balance sheet date.

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Represents a total which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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