Real Estate Properties (Details 2) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Sep. 30, 2011 Y	Dec. 31, 2010
Balance Sheets:
Real estate properties	$ 7,192,194	$ 6,357,258
Acquired real estate leases	360,293	233,913
Rents receivable, net	212,737	191,237
Other assets, net	182,259	171,380
Properties held for sale	43,573	114,426
Assumed real estate lease obligations	72,619	65,940
Rent collected in advance	35,593	27,988
Security deposits	23,710	22,523
Liabilities related to properties held for sale	463	1,492
Real estate properties held for sale
Real estate properties information
Probable selling period of property to be classified as held-for-sale (in years)	1
Balance Sheets:
Real estate properties	40,487	105,291
Acquired real estate leases	114	1,104
Rents receivable, net	202	4,446
Other assets, net	2,770	3,585
Properties held for sale	43,573	114,426
Assumed real estate lease obligations	7	7
Rent collected in advance	249	1,187
Security deposits	207	298
Liabilities related to properties held for sale	$ 463	$ 1,492

This element represents the number of years within which the property should probably be sold to be classified as held-for-sale.

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- Definition

For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

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-Paragraph 3

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

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-Subparagraph (SX 210.7-03.5)

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- Definition

Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

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-Name Accounting Standards Codification

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-Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response)

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The aggregate sum of gross carrying value of a major finite-lived intangible asset class, less accumulated amortization and any impairment charges. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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- Definition

Represents properties which were acquired directly or through foreclosure for which a committed plan to sell exists and an active program to market such properties has been initiated.

+ Details

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- Definition

Liability (such as a mortgage) related to a disposal group that is held for sale and anticipated to be sold in less than one year. The liability is expected to be discharged as part of the plan of sale for the asset.

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-Publisher FASB

-Name Accounting Standards Codification

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-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.

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- Definition

This element represents a liability associated with the acquisition of an off-market lease when the terms of the lease are unfavorable to the market terms for the lease at the date of acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 37

-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.

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- Definition

The aggregate carrying amounts, as of the balance sheet date, of assets not separately disclosed in the balance sheet.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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- Definition

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.

+ References

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-Subparagraph (SX 210.7-03.1(d))

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ Details

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- Definition

This element represents money paid in advance to protect the provider of a product or service, such as a lessor, against damage or nonpayment by the buyer or tenant (lessee) during the term of the agreement. Such damages may include physical damage to the property, theft of property, and other contractual breaches. Security deposits held may be interest or noninterest bearing.

+ References

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-Name Accounting Standards Codification

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-Paragraph 1

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