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Disposed Properties - Schedule of Disposal Groups (Details) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Jun. 26, 2018 USD ($) | Mar. 21, 2018 USD ($) | Dec. 31, 2019 USD ($) ft² | Dec. 31, 2018 USD ($) ft² | Dec. 31, 2017 USD ($) ft²
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Gross Disposition Price |  |  | $ 357,800 | $ 466,175 | $ 244,066
Gain (Loss) on Extinguishment of Debt |  |  | $ (2,901) | $ 9,103 | $ 840
Retail |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Square Feet | ft² |  |  | 8,300,000 | 9,500,000 | 12,400,000
Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Square Feet | ft² |  |  | 2,098,400 | 3,481,000 |
Gross Disposition Price |  |  | $ 357,800 | $ 466,175 |
Gain (Loss) on Sale and Transfer of Investment Properties, net |  |  | 62,011 | 95,097 |
Gain (Loss) on Extinguishment of Debt |  |  | $ (2,901) | $ 9,157 |
Brooks Corner | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Square Feet | ft² |  |  | 173,000 |  |
Gross Disposition Price |  |  | $ 26,300 |  |
Gain (Loss) on Sale and Transfer of Investment Properties, net |  |  | 5,531 |  |
Gain (Loss) on Extinguishment of Debt |  |  | $ (809) |  |
Silverlake | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Square Feet | ft² |  |  | 101,000 |  |
Gross Disposition Price |  |  | $ 6,650 |  |
Gain (Loss) on Sale and Transfer of Investment Properties, net |  |  | 131 |  |
Gain (Loss) on Extinguishment of Debt |  |  | $ 0 |  |
Promenade Fultondale | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Square Feet | ft² |  |  | 207,600 |  |
Gross Disposition Price |  |  | $ 23,200 |  |
Gain (Loss) on Sale and Transfer of Investment Properties, net |  |  | 1,861 |  |
Gain (Loss) on Extinguishment of Debt |  |  | $ 0 |  |
Crossroads at Chesapeake Square and Chesapeake Commons | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Square Feet | ft² |  |  | 198,700 |  |
Gross Disposition Price |  |  | $ 23,100 |  |
Gain (Loss) on Sale and Transfer of Investment Properties, net |  |  | 1,353 |  |
Gain (Loss) on Extinguishment of Debt |  |  | $ 0 |  |
West Creek | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Square Feet | ft² |  |  | 53,300 |  |
Gross Disposition Price |  |  | $ 18,700 |  |
Gain (Loss) on Sale and Transfer of Investment Properties, net |  |  | 5,962 |  |
Gain (Loss) on Extinguishment of Debt |  |  | $ 0 |  |
Boynton Commons | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Square Feet | ft² |  |  | 210,300 |  |
Gross Disposition Price |  |  | $ 50,000 |  |
Gain (Loss) on Sale and Transfer of Investment Properties, net |  |  | 18,405 |  |
Gain (Loss) on Extinguishment of Debt |  |  | $ 0 |  |
Quebec Square | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Square Feet | ft² |  |  | 207,600 |  |
Gross Disposition Price |  |  | $ 42,250 |  |
Gain (Loss) on Sale and Transfer of Investment Properties, net |  |  | (800) |  |
Gain (Loss) on Extinguishment of Debt |  |  | $ (2,092) |  |
Northwest Marketplace | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Square Feet | ft² |  |  | 185,200 |  |
Gross Disposition Price |  |  | $ 29,500 |  |
Gain (Loss) on Sale and Transfer of Investment Properties, net |  |  | 7,037 |  |
Gain (Loss) on Extinguishment of Debt |  |  | 0 |  |
Northwest Marketplace | Retail | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Condemnation |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Square Feet | ft² |  |  |  | 0 |
Gross Disposition Price |  |  |  | $ 0 |
Gain (Loss) on Sale and Transfer of Investment Properties, net |  |  | $ 248 | 248 |
Gain (Loss) on Extinguishment of Debt |  |  |  | $ 0 |
White Oak Crossing | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Square Feet | ft² |  |  | 564,700 |  |
Gross Disposition Price |  |  | $ 92,500 |  |
Gain (Loss) on Sale and Transfer of Investment Properties, net |  |  | 21,737 |  |
Gain (Loss) on Extinguishment of Debt |  |  | $ 0 |  |
Woodbridge Crossing | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Square Feet | ft² |  |  | 197,000 |  |
Gross Disposition Price |  |  | $ 45,600 |  |
Gain (Loss) on Sale and Transfer of Investment Properties, net |  |  | 794 |  |
Gain (Loss) on Extinguishment of Debt |  |  | $ 0 |  |
Sherman Town Center I & II | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Square Feet | ft² |  |  |  | 485,000 |
Gross Disposition Price |  |  |  | $ 63,000 |
Gain (Loss) on Sale and Transfer of Investment Properties, net |  |  |  | 12,382 |
Gain (Loss) on Extinguishment of Debt |  |  |  | $ 0 |
Grafton Commons | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Square Feet | ft² |  |  |  | 239,000 |
Gross Disposition Price |  |  |  | $ 33,500 |
Gain (Loss) on Sale and Transfer of Investment Properties, net |  |  |  | 6,564 |
Gain (Loss) on Extinguishment of Debt |  |  |  | $ 0 |
Lakeport Commons | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Square Feet | ft² |  |  |  | 283,000 |
Gross Disposition Price |  |  |  | $ 31,000 |
Gain (Loss) on Sale and Transfer of Investment Properties, net |  |  |  | (666) |
Gain (Loss) on Extinguishment of Debt |  |  |  | $ 0 |
Stonecrest Marketplace | Retail | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Exchange |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Square Feet | ft² |  |  |  | 265,000 |
Gross Disposition Price |  |  |  | $ 0 |
Gain (Loss) on Sale and Transfer of Investment Properties, net |  | $ 1,777 |  | 1,777 |
Gain (Loss) on Extinguishment of Debt |  |  |  | $ 10,752 |
Carrying value, surrendered properties |  | $ 23,932 |  |  |
Market at Morse/Hamilton | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Square Feet | ft² |  |  |  | 45,000 |
Gross Disposition Price |  |  |  | $ 10,000 |
Gain (Loss) on Sale and Transfer of Investment Properties, net |  |  |  | 1,592 |
Gain (Loss) on Extinguishment of Debt |  |  |  | $ 0 |
Siegen Plaza | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Square Feet | ft² |  |  |  | 156,000 |
Gross Disposition Price |  |  |  | $ 29,000 |
Gain (Loss) on Sale and Transfer of Investment Properties, net |  |  |  | 3,849 |
Gain (Loss) on Extinguishment of Debt |  |  |  | $ (54) |
Tomball Town Center | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Square Feet | ft² |  |  |  | 67,000 |
Gross Disposition Price |  |  |  | $ 22,750 |
Gain (Loss) on Sale and Transfer of Investment Properties, net |  |  |  | 7,184 |
Gain (Loss) on Extinguishment of Debt |  |  |  | $ 0 |
Bellerive Plaza | Retail | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Exchange |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Square Feet | ft² |  |  |  | 76,000 |
Gross Disposition Price |  |  |  | $ 0 |
Gain (Loss) on Sale and Transfer of Investment Properties, net | $ (22) |  |  | (22) |
Gain (Loss) on Extinguishment of Debt |  |  |  | $ 1,694 |
Carrying value, surrendered properties | $ 4,771 |  |  |  |
Parkway Centre North | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Square Feet | ft² |  |  |  | 143,000 |
Gross Disposition Price |  |  |  | $ 23,700 |
Gain (Loss) on Sale and Transfer of Investment Properties, net |  |  |  | 5,357 |
Gain (Loss) on Extinguishment of Debt |  |  |  | $ (1,695) |
Tulsa Hills | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Square Feet | ft² |  |  |  | 473,000 |
Gross Disposition Price |  |  |  | $ 70,000 |
Gain (Loss) on Sale and Transfer of Investment Properties, net |  |  |  | 13,476 |
Gain (Loss) on Extinguishment of Debt |  |  |  | $ 0 |
McKinney Town Center | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Square Feet | ft² |  |  |  | 243,000 |
Gross Disposition Price |  |  |  | $ 51,000 |
Gain (Loss) on Sale and Transfer of Investment Properties, net |  |  |  | 15,430 |
Gain (Loss) on Extinguishment of Debt |  |  |  | $ 0 |
Riverstone Shopping Center | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Square Feet | ft² |  |  |  | 273,000 |
Gross Disposition Price |  |  |  | $ 27,750 |
Gain (Loss) on Sale and Transfer of Investment Properties, net |  |  |  | (320) |
Gain (Loss) on Extinguishment of Debt |  |  |  | $ (1,540) |
Hiram Pavilion | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Square Feet | ft² |  |  |  | 363,000 |
Gross Disposition Price |  |  |  | $ 44,350 |
Gain (Loss) on Sale and Transfer of Investment Properties, net |  |  |  | 22,124 |
Gain (Loss) on Extinguishment of Debt |  |  |  | $ 0 |
Poplin Place | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Square Feet | ft² |  |  |  | 228,000 |
Gross Disposition Price |  |  |  | $ 28,300 |
Gain (Loss) on Sale and Transfer of Investment Properties, net |  |  |  | 2,841 |
Gain (Loss) on Extinguishment of Debt |  |  |  | $ 0 |
Walden Park | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Square Feet | ft² |  |  |  | 34,000 |
Gross Disposition Price |  |  |  | $ 5,325 |
Gain (Loss) on Sale and Transfer of Investment Properties, net |  |  |  | 5 |
Gain (Loss) on Extinguishment of Debt |  |  |  | $ 0 |
Streets of Cranberry | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Square Feet | ft² |  |  |  | 108,000 |
Gross Disposition Price |  |  |  | $ 26,500 |
Gain (Loss) on Sale and Transfer of Investment Properties, net |  |  |  | 3,276 |
Gain (Loss) on Extinguishment of Debt |  |  |  | $ 0 |

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