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Subsequent Events - (Details) $ in Thousands |  |  |  |  |  | 9 Months Ended
--- | --- | --- | --- | --- | --- | ---
Nov. 06, 2018 USD ($) ft² | Nov. 05, 2018 USD ($) | Nov. 02, 2018 USD ($) | Oct. 23, 2018 USD ($) ft² | Oct. 05, 2018 USD ($) ft² Properties | Sep. 30, 2018 USD ($) ft² | Sep. 30, 2017 USD ($) ft²
Subsequent Event [Line Items] |  |  |  |  |  |  |
Gross disposition price |  |  |  |  |  | $ 282,950 | $ 206,130
Retail |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Square Feet | ft² |  |  |  |  |  | 2,232,000 | 1,250,000
Gross disposition price |  |  |  |  |  | $ 282,950 | $ 152,630
Subsequent Event | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Square Feet | ft² | 879,000 |  |  |  |  |  |
Gross disposition price | $ 123,100 |  |  |  |  |  |
Subsequent Event | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations | McKinney Town Center |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Square Feet | ft² |  |  |  |  | 243,000 |  |
Gross disposition price |  |  |  |  | $ 51,000 |  |
Subsequent Event | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Riverstone Shopping Center |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Square Feet | ft² |  |  |  |  | 273,000 |  |
Gross disposition price |  |  |  |  | $ 27,750 |  |
Subsequent Event | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Victory Lakes Shopping Center |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Square Feet | ft² |  |  |  |  | 370,000 |  |
Gross disposition price |  |  |  |  | $ 53,000 |  |
Subsequent Event | Retail | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Hiram Pavilion |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Square Feet | ft² |  |  |  | 363,000 |  |  |
Gross disposition price |  |  |  | $ 44,350 |  |  |
Subsequent Event | Mortgages payable | Woodlake Crossing |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Debt extinguished |  | $ 7,575 |  |  |  |  |
Subsequent Event | IAGM Retail Fund I, LLC | Mortgages payable |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Debt extinguished |  |  |  |  | $ 38,300 |  |
Number of retail properties | Properties |  |  |  |  | 2 |  |
Subsequent Event | IAGM Retail Fund I, LLC | Senior Secured Term Loan |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Debt facility |  |  | $ 152,000 |  |  |  |
Extension fee |  |  | 0.10% |  |  |  |
Subsequent Event | IAGM Retail Fund I, LLC | Senior Secured Term Loan | One-month LIBOR |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Basis spread on variable interest rate (percent) |  |  | 1.55% |  |  |  |

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