Real Estate Properties (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Balance Sheets:
Real estate properties	$ 7,989,769	$ 7,829,409
Acquired real estate leases	416,763	427,756
Rents receivable, net	267,733	253,394
Other assets, net	221,790	211,293
Properties held for sale	159,501	171,832
Assumed real estate lease obligations	66,576	69,304
Rent collected in advance	34,703	35,700
Security deposits	23,822	23,860
Liabilities related to properties held for sale	1,994	2,339
Real estate properties held for sale
Balance Sheets:
Real estate properties	152,940	164,041
Acquired real estate leases	453	453
Rents receivable, net	2,624	2,791
Other assets, net	3,484	4,547
Properties held for sale	159,501	171,832
Assumed real estate lease obligations	21	21
Rent collected in advance	598	854
Security deposits	1,375	1,464
Liabilities related to properties held for sale	$ 1,994	$ 2,339

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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.

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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.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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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.

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No definition available.

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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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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.

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

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Amount of real estate investment property 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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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.

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