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Acquisitions, Dispositions and Held for Sale (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2016 USD ($) | Jul. 31, 2016 USD ($) | May 31, 2016 USD ($) | Apr. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Nov. 30, 2015 USD ($) | Jul. 31, 2015 USD ($) | Jun. 30, 2015 USD ($) | Apr. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2016 USD ($) outparcel | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) | Jun. 18, 2015 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price, Gross |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 153,960 |  | $ 104,860 |
Sales Price, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 149,972 |  | 103,537 |
Gain |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,728 |  | 21,331 |
Loss on impairment |  |  |  |  |  |  |  |  |  |  |  | $ 53,558 |  |  |  | $ 884 |  |  | $ 116,736 | $ 3,665 |  |
Percentage of equity interest in real estate property |  | 50.00% |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  | 50.00% |  |  |
Gain (loss) on sale of real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,503 | $ 18,167 |  |
Held for sale | [1] | $ 32,250 |  |  |  |  | $ 0 |  |  |  |  | $ 32,250 |  |  | $ 0 |  |  | $ 0 | $ 32,250 |  | $ 0 |
Real estate held for sale as percentage of total assets |  | 0.50% |  |  |  |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  | 0.50% |  |  |
River Ridge Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity interest in real estate property |  | 25.00% |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  | 25.00% |  |  |
Oak Branch Business Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price, Gross |  | $ 2,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price, Net |  | 2,148 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  | $ 122 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Lakes Mall/Fashion Square |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price, Gross |  |  | $ 66,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price, Net |  |  | 65,514 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain |  |  | 273 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  |  |  |  | $ 32,096 |  |  |  |  |  |  |  |  |
Bonita Lakes Mall and Crossing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price, Gross |  |  |  | $ 27,910 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price, Net |  |  |  | 27,614 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain |  |  |  | $ 216 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,323 |  |  |  |  |  |  |  |
The Crossings at Marshalls Creek |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price, Gross |  |  |  |  | $ 23,650 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price, Net |  |  |  |  | 21,791 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain |  |  |  |  | $ 3,239 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
River Ridge Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price, Gross |  |  |  |  |  | $ 33,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price, Net |  |  |  |  |  | 32,905 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,510 |  |  |  |  |  |  |  |
Ownership percentage sold |  |  |  |  |  | 75.00% |  |  |  |  |  |  |  |  |  |  |  |  | 75.00% |  |  |
Mayfaire Community Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price, Gross |  |  |  |  |  |  | 56,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price, Net |  |  |  |  |  |  | 55,955 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 397 |  |  |  |  |  |  |
Chapel Hill Crossing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price, Gross |  |  |  |  |  |  | 2,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price, Net |  |  |  |  |  |  | 2,178 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,914 |  |  |  |  |  |  |
Waynesville Commons |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price, Gross |  |  |  |  |  |  |  | $ 14,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price, Net |  |  |  |  |  |  |  | 14,289 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain |  |  |  |  |  |  |  | $ 5,071 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Madison Plaza |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price, Gross |  |  |  |  |  |  |  |  | $ 5,700 |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price, Net |  |  |  |  |  |  |  |  | 5,472 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain |  |  |  |  |  |  |  |  | $ 2,769 |  |  |  |  |  |  |  |  |  |  |  |  |
Eastgate Crossing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price, Gross |  |  |  |  |  |  |  |  |  | $ 21,060 |  |  |  |  |  |  |  |  |  |  |  |
Sales Price, Net |  |  |  |  |  |  |  |  |  | 20,688 |  |  |  |  |  |  |  |  |  |  |  |
Gain |  |  |  |  |  |  |  |  |  | 13,491 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from lease of tenant space |  |  |  |  |  |  |  |  |  |  |  |  | 478 |  | 574 |  |  |  |  |  |  |
Earn out proceeds, amount earned |  |  |  |  |  |  |  |  |  |  |  |  | $ 508 |  | $ 625 |  |  |  |  |  |  |
Mortgage loan assumed at sale |  |  |  |  |  |  |  |  |  | $ 14,570 |  |  |  |  |  |  |  |  |  |  |  |
Madison Square |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price, Gross |  |  |  |  |  |  |  |  |  |  | $ 5,000 |  |  |  |  |  |  |  |  |  |  |
Sales Price, Net |  |  |  |  |  |  |  |  |  |  | 4,955 |  |  |  |  |  |  |  |  |  |  |
Gain |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,620 |  |  |  |  |
Mayfaire Community Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%
Sales price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 191,988
Revenue from acquiree included in consolidated financial statements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,982 |  |  |  |
Income from acquiree included in consolidated financial statements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 410 |  |  |  |
Mortgages | Fashion Square |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage note payables assumed |  |  | $ 38,237 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outparcel Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,113 |  |  |
Number of properties disposed of | outparcel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  |  |
Parking Deck Project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,184 |  |  |
[1] | As of September 30, 2016, includes $618,034 of assets related to consolidated variable interest entities that can be used only to settle obligations of the consolidated variable interest entities and $484,231 of liabilities of consolidated variable interest entities for which creditors do not have recourse to the general credit of the Company. See Note 5.

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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=73531372&loc=d3e2207-128464 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + 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=66011266&loc=d3e33918-111571 + Details
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- Definition The net gain (loss) resulting from sales and other disposals of other real estate owned, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned after acquisition or physical possession. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14(d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition The cash inflow from the sale of a lease held for investment, which may be a lease of real estate, equipment or other fixed assets for a specified time in exchange for payment, usually in the form of rent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 + Details
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- Definition Cash received for the sale of real estate that is not part of an investing activity during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 + Details
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- Definition Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity. + 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(f)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Revenue from the sale of commercial, industrial, or residential property during the period. This element is more likely than not relevant to an entity for which real estate operations are a principal activity. If real estate operations are not a principal activity, the reporting entity would likely use a gain (loss) on sale of property, plant, or equipment type element. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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