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Tenant and Other Receivables, net: (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Accrued percentage rents	Dec. 31, 2013 Accrued percentage rents	Sep. 30, 2014 6.5% Note Receivable	Mar. 17, 2014 6.5% Note Receivable	Mar. 17, 2014 5.0% Note Receivable
Components of tenant and other receivables, net
Allowance for doubtful accounts	$ 4,224	$ 2,878
Accounts receivable			3,130	9,824
Deferred rent receivable due to straight-line rent adjustments	56,943	53,380
Notes receivable					$ 6,461	$ 6,500	$ 3,103
Note receivable, interest rate (as a percent)						6.46%	5.00%

X

- Definition

The stated interest rate on the note receivable.

+ References

No definition available.

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- Definition

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.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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- Definition

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.

+ References

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- Definition

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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- Definition

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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