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Subsequent Events (Details) - USD ($) |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 21, 2018 | Jan. 24, 2018 | Jan. 18, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Feb. 20, 2018 | Jan. 29, 2018
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Purchase Price |  |  |  | $ 254,532,000 | $ 756,842,000 |  |  |
Proceeds from the disposition of properties |  |  |  | 260,711,000 | 150,378,000 | $ 168,895,000 |  |
Proceeds from notes receivable |  |  |  | 32,000,000 | 42,819,000 | $ 15,984,000 |  |
Stock repurchase authorized amount |  |  |  | 20,000,000.0 |  |  |  |
Fund V |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Purchase Price |  |  |  | 167,240,000 |  |  |  |
Fund IV |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Purchase Price |  |  |  | 44,492,000 | 237,250,000 |  |  |
Mortgages |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Borrowings, amount |  |  |  | 162,900,000.0 |  |  |  |
Core Portfolio |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Purchase Price |  |  |  | 42,800,000 | $ 519,592,000 |  |  |
Core Portfolio | $150 Million Term Loan | Unsecured Debt |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 150,000,000.0 |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 300,000,000.0 |
Stock repurchase authorized amount |  |  |  |  |  |  | 200,000,000.0 |
Subsequent Event | Other Secured Financings |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | 40,400,000.0 |
Subsequent Event | 108 W. Broughton And 110 W. Broughton Street Properties | Fund IV | Disposed of by sale |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Proceeds from the disposition of properties |  |  | $ 8,000,000 |  |  |  |  |
Subsequent Event | Plaza Santa Fe | Mortgages | Fund V |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Borrowings, amount |  | $ 22,900,000.0 |  |  |  |  |  |
Subsequent Event | New Towne Plaza | Mortgages | Fund V |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Borrowings, amount |  |  |  |  |  |  |  | $ 16,900,000.0
Subsequent Event | Senior Unsecured Credit Facility | Unsecured Debt |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | 500,000,000.0 |
Subsequent Event | Revolving Credit Facility | Unsecured Debt |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | 150,000,000.0 |
Subsequent Event | $300 Million Term Loan | Unsecured Debt |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | 350,000,000.0 |
Subsequent Event | $150 Million Term Loan | Unsecured Debt |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | 150,000,000.0 |
Subsequent Event | Trussville, Alabama | Shopping Center | Fund V |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Purchase Price | $ 45,200,000 |  |  |  |  |  |  |
Subsequent Event | Core Portfolio |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Proceeds from notes receivable |  | $ 26,000,000 |  |  |  |  |  |
Subsequent Event | Core Portfolio | Revolving Credit Facility | Unsecured Debt |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | 150,000,000.0 |
Subsequent Event | Core Portfolio | $150 Million Term Loan | Unsecured Debt |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 150,000,000.0 |

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