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Tenant and Other Receivables, net: (Details) (USD $) In Thousands, unless otherwise specified |  |  |  |  |  |  | 3 Months Ended |  | 3 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2012 Accrued percentage rents | Dec. 31, 2011 Accrued percentage rents | Mar. 31, 2012 Note receivable secured by deed of trust | Dec. 31, 2011 Note receivable secured by deed of trust | Mar. 31, 2012 Note receivable from Pederson | Mar. 31, 2011 Note receivable from Pederson | Dec. 31, 2011 Note receivable from Pederson | Mar. 31, 2012 Note receivable from AWE Talisman Company note | Mar. 27, 2012 Note receivable from AWE Talisman Company
Tenant and Other Receivables, net: |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts | $ 3,898 | $ 4,626 |  |  |  |  |  |  |  |  |
Components of tenant and other receivables, net |  |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  | 2,498 | 7,583 |  |  |  |  |  |  |
Note receivable, interest rate (as a percent) |  |  |  |  | 5.50% |  | 11.55% |  |  |  | 5.00%
Notes receivable |  |  |  |  | 8,678 | 8,743 | 3,445 |  | 3,445 |  | 12,500
Interest income on notes receivable |  |  |  |  |  |  | $ 104 | $ 102 |  | $ 8 |
Number of notes receivable |  |  |  |  |  |  |  |  |  | 2 |

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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 -Section 02 -Paragraph 3 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.9) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),5) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition For an unclassified balance sheet, an amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money at a future date(s). 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. This amount does not include amounts related to receivables held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(3)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 9 -Section 03 -Paragraph 10 -Subparagraph 3 + Details
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