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Disposed Properties - Schedule of Disposal Groups (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) ft² | Dec. 31, 2016 ft²
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Square Feet | 501,276 | 322,326
Retail Site [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Square Feet | 12,444,703 | 12,155,909
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Retail Site [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Gross Disposition Price | $ | $ 186,380 |
Square Feet | 1,558,000 |
Penn Park Oklahoma City, OK [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Retail Site [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Gross Disposition Price | $ | $ 29,050 |
Square Feet | 242,000 |
Sparks Crossing Sparks, NV [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Retail Site [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Gross Disposition Price | $ | $ 40,280 |
Square Feet | 336,000 |
Lincoln Village Chicago, IL [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Retail Site [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Gross Disposition Price | $ | $ 30,000 |
Square Feet | 164,000 |
Pavilions At Hartman Heritage, Independence, MO [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Retail Site [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Gross Disposition Price | $ | $ 21,700 |
Square Feet | 223,000 |
Legacy Crossing, Marion, OH [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Retail Site [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Gross Disposition Price | $ | $ 10,250 |
Square Feet | 134,000 |
Heritage Plaza, Chicago, IL [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Retail Site [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Gross Disposition Price | $ | $ 21,350 |
Square Feet | 132,000 |
Dothan Plaza, Dothan, AL [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Retail Site [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Gross Disposition Price | $ | $ 33,750 |
Square Feet | 327,000 |

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