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Disposed Properties - Narrative (Details) ft² in Thousands, $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Mar. 21, 2018 Properties | Mar. 31, 2018 USD ($) ft² Properties | Mar. 31, 2017 USD ($) ft² | Dec. 31, 2017 ft²
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of disposed properties |  | 18,280 |  |
Gain on transfer of asset, retail properties |  | $ 1,777 |  |
Gain (loss) on condemnation |  | 248 |  |
Proceeds from sale and transfer of investment properties, net |  | 119,825 | $ 28,474 |
Number of surrendered properties | Properties | 1 |  |  |
Carrying value, surrendered properties |  | 23,932 |  |
Gain on extinguishment of debt |  | $ 10,751 | $ 0 |
Square Feet | ft² |  | 3,000 | 300 | 3,200
Gross disposition price |  | $ 127,500 | $ 29,050 |
Retail |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Square Feet | ft² |  | 11,200 | 12,700 | 12,400
Retail | Penn Park, Oklahoma City, OK |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from sale and transfer of investment properties, net |  |  | $ 28,474 |
Square Feet | ft² |  |  | 242 |
Gross disposition price |  |  | $ 29,050 |
Gain on sale |  |  | $ 1,021 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Retail |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of disposed properties | Properties |  | 3 |  |
Square Feet | ft² |  | 1,007 |  |
Gross disposition price |  | $ 127,500 |  |

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- Definition The gain (loss) is the pre-tax difference between the net condemnation award and the entity's adjusted basis of the condemned property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 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=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
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