Real Estate Properties (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Balance Sheets:
Real estate properties	$ 5,915,516	$ 5,537,165
Acquired real estate leases	244,634	255,812
Rents receivable	239,766	223,769
Other assets, net	206,967	188,675
Properties held for sale	214,677	573,531
Mortgage notes payable	898,804	914,510
Assumed real estate lease obligations	33,064	33,935
Rent collected in advance	29,618	27,553
Security deposits	13,682	11,976
Liabilities related to properties held for sale	23,066	28,734
Real estate properties held for sale
Balance Sheets:
Real estate properties	201,557	536,552
Acquired real estate leases	4,943	6,937
Rents receivable	4,207	14,180
Other assets, net	3,970	15,862
Properties held for sale	214,677	573,531
Mortgage notes payable	19,688	20,018
Assumed real estate lease obligations	1,419	2,070
Rent collected in advance	859	4,043
Security deposits	1,100	2,603
Liabilities related to properties held for sale	$ 23,066	$ 28,734

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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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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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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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