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Property: (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended |  | 9 Months Ended |  | 0 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2014 Wilshire Boulevard | Sep. 30, 2014 Wilshire Boulevard | Aug. 28, 2014 Wilshire Boulevard sqft | Sep. 30, 2014 Rotterdam Square sqft | Sep. 30, 2014 Somersville Town Center sqft | Sep. 30, 2014 Lake Square Mall sqft | Sep. 17, 2013 Camelback Colonnade | Sep. 30, 2013 Camelback Colonnade
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Land | $ 1,713,298 |  | $ 1,713,298 |  | $ 1,707,005 |  |  |  |  |  |  |  |
Buildings and improvements | 6,508,764 |  | 6,508,764 |  | 6,555,212 |  |  |  |  |  |  |  |
Tenant improvements | 545,336 |  | 545,336 |  | 537,754 |  |  |  |  |  |  |  |
Equipment and furnishings | 144,950 |  | 144,950 |  | 152,198 |  |  |  |  |  |  |  |
Construction in progress | 346,914 |  | 346,914 |  | 229,169 |  |  |  |  |  |  |  |
Total | 9,259,262 |  | 9,259,262 |  | 9,181,338 |  |  |  |  |  |  |  |
Less accumulated depreciation | (1,688,626) |  | (1,688,626) |  | (1,559,572) |  |  |  |  |  |  |  |
Property, net | 7,570,636 |  | 7,570,636 |  | 7,621,766 |  |  |  |  |  |  |  |
Depreciation expenses | 68,663 | 68,589 | 205,158 | 200,222 |  |  |  |  |  |  |  |  |
Impairment loss | (238) | (27,972) | (8,754) | (27,972) |  |  |  |  |  |  |  |  |
Gain (loss) on remeasurement, sale or write down of assets, net | 9,561 | 8,249 | (1,504) | 12,279 |  |  |  |  | (1,602) |  |  |  |
Property area (in square feet) |  |  |  |  |  |  |  | 40,000 | 585,000 | 348,000 | 559,000 |  |
Gain on the sale of assets | 766 | (120) | (181) | 3,910 |  |  |  |  |  |  |  |  |
Remeasurement gain |  |  |  |  |  |  |  |  |  |  |  | 36,341 | 36,341
Gain (loss) on remeasurement, sale or write down of assets, net | $ (738) | $ 38,104 | $ (7,110) | $ 183,154 |  | $ 9,033 | $ 9,033 |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  | 30.00% |  |  |  |  |

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- Definition Represents the amount of gain or loss resulting from either the difference between the carrying value and the sales price or remeasurement of the carrying value of assets during the period, reported by an equity method investment of the entity. + References No definition available. + Details
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- Definition Gains or losses resulting from either the difference between the carrying value and the sales price or remeasurement of the carrying value for consolidated investment property and equity method investments. + References No definition available. + Details
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- Definition Area of a real estate property. + References No definition available. + Details
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- Definition In a business combination achieved in stages, this element represents the amount of net gain (loss) recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The expense recognized in the current period that allocates the cost of nonproduction tangible assets over their useful lives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The current amount of expenditures for a real estate project that has not yet been completed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.10) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2941-110230 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 225 -Section 45 -Paragraph 11 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28367520&loc=d3e92212-112881 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Impairment -URI http://asc.fasb.org/extlink&oid=6515133 + Details
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- Definition Aggregate of the carrying amounts as of the balance sheet date of investments in building and building improvements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount before accumulated depletion of real estate held for productive use, excluding land held for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6812-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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