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Tenant and Other Receivables, net: (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended							3 Months Ended		9 Months Ended		0 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013 Accrued percentage rents	Dec. 31, 2012 Accrued percentage rents	Sep. 30, 2013 Note receivable secured by deed of trust	Dec. 31, 2012 Note receivable secured by deed of trust	Sep. 30, 2013 Related Parties Note Receivable, JR Holdings [Member]	Sep. 30, 2012 Related Parties Note Receivable, JR Holdings [Member]	Sep. 30, 2013 Related Parties Note Receivable, JR Holdings [Member]	Sep. 30, 2012 Related Parties Note Receivable, JR Holdings [Member]	Oct. 08, 2013 Subsequent event Related Parties Note Receivable, JR Holdings [Member]
Components of tenant and other receivables, net
Allowance for doubtful accounts	$ 2,672		$ 2,374
Accounts receivable				2,180	9,168		0
Deferred rent receivable due to straight-line rent adjustments	53,523		49,129
Distributions to Co-venture Partner	14,496	34,615										0
Note receivable, interest rate (as a percent)						5.50%
Notes receivable							3,963	4,427		4,427
Interest income on notes receivable								$ 156	$ 130	$ 464	$ 388

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This element represents the distributions to co - venture partner.

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The stated interest rate on the note receivable.

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For unclassified balance sheet, amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business.

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The valuation allowance as of the balance sheet date to reduce the gross amount of receivables to estimated net realizable value, which would be presented in parentheses on the face of the balance sheet.

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The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property, by the lessor or lessee, respectively. Such receivable is reduced by allowances attributable to, for instance, credit risk associated with a lessee.

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Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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