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Investments in and Advances to Unconsolidated Affiliates - Fund Investments (Details) |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 29, 2018 USD ($) property | May 15, 2018 USD ($) | Jan. 18, 2018 USD ($) property | Jun. 30, 2017 USD ($) | Feb. 15, 2017 USD ($) | Jan. 31, 2017 USD ($) | Jun. 30, 2018 USD ($) property | Dec. 21, 2017 USD ($) property | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) property | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cost method investments |  |  |  |  |  |  | $ 556,000 |  |  | $ 556,000 |  | $ 556,000
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  | $ 5,019,000 |  | $ 4,340,000 | 6,703,000 | $ 17,043,000 |
Proceeds from the disposition of properties, net |  |  |  |  |  |  |  |  |  | $ 25,218,000 | 0 |
Mervyns I and Mervyns II |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Distribution from equity method investment |  |  |  |  |  |  |  |  |  |  |  | 1,100,000
Equity method investments |  |  |  |  |  |  |  |  |  |  |  | 0
Albertson's |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cost method investment ownership interest |  |  |  |  |  |  | 1.05% |  |  | 1.05% |  |
Distribution from cost method investment |  |  |  |  |  |  |  |  |  |  |  | 2,400,000
Cost method investments |  |  |  |  |  |  |  |  |  |  |  | 0
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  |  |  | 2,000,000
Fund IV |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  | $ 71,242,000 |  |  | $ 71,242,000 |  | 82,143,000
Fund IV's Broughton Street Portfolio venture |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of retail properties | property | 2 |  |  |  |  |  |  |  |  |  |  |
Losses on cost method investments | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Fund III |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  | $ 392,000 |  |  | $ 392,000 |  | $ 373,000
Fund III's Storage Post venture |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Distribution from cost method investment |  | $ 3,200,000 |  |  |  |  |  |  |  |  |  |
Cost method investments |  | 0 |  |  |  |  |  |  |  |  |  |
Partnership Interest | Fund IV's Broughton Street Portfolio venture |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Losses on cost method investments | $ 100,000 |  |  |  |  |  |  |  |  |  |  |
Partnership Interest | Fund III's Storage Post venture |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Distribution from cost method investment |  | $ 800,000 |  |  |  |  |  |  |  |  |  |
Broughton St. Portfolio Savannah, GA | Fund IV |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of retail properties | property |  |  |  |  |  |  | 14 |  |  | 14 |  |
Disposed of by sale |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  |  |  |  | 3,300,000 |  |  |
Disposed of by sale | Partnership Interest |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  |  |  |  | 800,000 |  |  |
Disposed of by sale | 2819 Kennedy Boulevard | Fund IV |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  | $ 6,300,000 |  |  |  |  |  |
Consideration received |  |  |  |  |  | 19,000,000 |  |  |  |  |  |
Proceeds from sale of equity method investments |  |  |  |  |  | 10,600,000 |  |  |  |  |  |
Disposed of by sale | 2819 Kennedy Boulevard | Fund IV | Mortgages |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  | 8,400,000 |  |  |  |  |  |
Disposed of by sale | 2819 Kennedy Boulevard | Affiliated Entity | Fund IV |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  | 6,200,000 |  |  |  |  |  |
Disposed of by sale | 2819 Kennedy Boulevard | Partnership Interest | Fund IV |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  | $ 1,400,000 |  |  |  |  |  |
Disposed of by sale | Arundel Plaza | Fund III |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  | $ 8,200,000 |  |  |  |  |  |  |
Consideration received |  |  |  |  | 28,800,000 |  |  |  |  |  |  |
Proceeds from sale of equity method investments |  |  |  |  | 18,800,000 |  |  |  |  |  |  |
Disposed of by sale | Arundel Plaza | Fund III | Mortgages |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  | 10,000,000 |  |  |  |  |  |  |
Disposed of by sale | Arundel Plaza | Affiliated Entity | Fund III |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  | 5,300,000 |  |  |  |  |  |  |
Disposed of by sale | Arundel Plaza | Partnership Interest | Fund III |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  | $ 1,300,000 |  |  |  |  |  |  |
Disposed of by sale | 1701 Belmont Avenue | Fund IV |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consideration received |  |  |  | $ 5,600,000 |  |  |  |  | $ 5,600,000 |  | $ 5,600,000 |
Proceeds from sale of equity method investments |  |  |  | 2,700,000 |  |  |  |  |  |  |  |
Disposed of by sale | 1701 Belmont Avenue | Fund IV | Mortgages |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  | 2,900,000 |  |  |  |  |  |  |  |
Disposed of by sale | 1701 Belmont Avenue | Affiliated Entity | Fund IV |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  | $ 3,300,000 |  |  |  |  |  |  |  |
Disposed of by sale | Broughton St. Portfolio Savannah, GA | Fund IV |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of retail properties | property |  |  | 2 |  |  |  |  | 5 |  |  |  |
Proceeds from the disposition of properties, net |  |  | $ 8,000,000 |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  | 400,000 |  |  |  |  | $ 1,200,000 |  |  |  |
Proceeds from sale of equity method investments |  |  |  |  |  |  |  | 11,000,000 |  |  |  |
Disposed of by sale | Broughton St. Portfolio Savannah, GA | Affiliated Entity | Fund IV |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  |  |  | 600,000 |  |  |  |
Disposed of by sale | Broughton St. Portfolio Savannah, GA | Partnership Interest | Fund IV |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  | $ 0 |  |  |  |  | $ 100,000 |  |  |  |

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