Real Estate Properties (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Balance Sheets:
Real estate properties	$ 5,537,165	$ 7,829,409
Acquired real estate leases	255,812	427,756
Rents receivable, net	223,769	253,394
Other assets, net	188,675	211,293
Properties held for sale	573,531	171,832
Mortgage notes payable, net	914,510	984,827
Assumed real estate lease obligations	33,935	69,304
Rent collected in advance	27,553	35,700
Security deposits	11,976	23,860
Liabilities related to properties held for sale	28,734	2,339
Real estate properties held for sale
Balance Sheets:
Real estate properties	536,552	164,041
Acquired real estate leases	6,937	453
Rents receivable, net	14,180	2,791
Other assets, net	15,862	4,547
Properties held for sale	573,531	171,832
Mortgage notes payable, net	20,018
Assumed real estate lease obligations	2,070	21
Rent collected in advance	4,043	854
Security deposits	2,603	1,464
Liabilities related to properties held for sale	$ 28,734	$ 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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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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