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Disposals of Operating Properties and Impairment Charge (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) property | Jun. 30, 2019 USD ($) property | Mar. 31, 2019 USD ($) property | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) property | Mar. 31, 2018 USD ($) property | Sep. 30, 2019 USD ($) property | Sep. 30, 2018 USD ($) | Oct. 31, 2019 property | Aug. 31, 2019 property | Jul. 31, 2019 property | Jun. 29, 2018 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of operating properties |  |  |  |  |  |  | $ 460,694 | $ 161,499 |  |  |  |
Gain (loss) on sale of operating properties, net | $ (5,714) | $ 24,100 |  | $ 0 |  |  | 24,965 | 8,329 |  |  |  |
Impairment charges | 8,538 |  |  | $ 0 |  |  | 37,723 | $ 38,847 |  |  |  |
Equity method investments, fair value |  |  |  |  |  |  |  |  |  |  |  | $ 10,000
Five Unnamed Impaired Properties |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges |  | 25,100 |  |  |  |  |  |  |  |  |  |
Real estate property, fair value disclosure |  | 152,900 |  |  |  |  |  |  |  |  |  |
One Unnamed Impaired Property |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges | 8,500 |  |  |  |  |  |  |  |  |  |  |
Real estate property, fair value disclosure | 12,600 |  |  |  |  |  | $ 12,600 |  |  |  |  |
Unnamed impaired property |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges |  |  | $ 4,100 |  |  | $ 24,100 |  |  |  |  |  |
Two Unnamed Impaired Properties |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties (in properties) | property |  |  |  |  | 2 |  |  |  |  |  |  |
Impairment charges |  |  |  |  | $ 14,800 |  |  |  |  |  |  |
Real estate property, fair value disclosure |  |  |  |  | 30,400 |  |  |  |  |  |  |
Eight Operating Properties |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of operating properties | $ 213,300 | $ 244,000 |  |  |  |  |  |  |  |  |  |
Whitehall Pike |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of operating properties |  |  | 13,500 |  |  |  |  |  |  |  |  |
Disposal group, not discontinued operation, gain (loss) on disposal |  |  | 6,600 |  |  |  |  |  |  |  |  |
Livingston Shopping Center, Plaza Volente, and Tamiami Crossing |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of operating properties |  |  |  |  | 89,000 |  |  |  |  |  |  |
Disposal group, not discontinued operation, gain (loss) on disposal |  |  |  |  | $ 7,800 |  |  |  |  |  |  |
Trussville Promenade and Memorial Commons |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of operating properties |  |  | 63,000 |  |  |  |  |  |  |  |  |
Disposal group, not discontinued operation, gain (loss) on disposal |  |  | 500 |  |  |  |  |  |  |  |  |
Fair Value, Inputs, Level 3 | Unnamed impaired property |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Real estate property, fair value disclosure |  |  | $ 10,000 |  |  | $ 24,300 |  |  |  |  |  |
TH Joint Venture |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 20.00%
Noncontrolling interest, ownership percentage by parent (as percent) |  |  |  |  |  |  |  |  |  |  |  | 80.00%
TH Joint Venture | Livingston Shopping Center, Plaza Volente, and Tamiami Crossing |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consideration for property contributed |  |  |  |  |  |  |  |  |  |  |  | $ 99,800
Equity method investment, ownership percentage (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 20.00%
Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties (in properties) | property | 8 | 8 |  |  |  |  | 8 |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Five Unnamed Impaired Properties |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties (in properties) | property |  | 5 |  |  |  |  |  |  |  | 1 | 2 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | One Unnamed Impaired Property |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties (in properties) | property | 1 |  |  |  |  |  | 1 |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Unnamed impaired property |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties (in properties) | property |  |  | 1 |  |  | 1 |  |  |  |  |  |
Subsequent Event | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Five Unnamed Impaired Properties |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties (in properties) | property |  |  |  |  |  |  |  |  | 1 |  |  |

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