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Investments in and Advances to Unconsolidated Affiliates - Fund Investments (Details) |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
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Jun. 30, 2017 USD ($) | Feb. 15, 2017 USD ($) | Dec. 21, 2016 USD ($) | Jan. 28, 2016 USD ($) | Jan. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) property properties | Dec. 21, 2017 USD ($) properties | Sep. 30, 2017 USD ($) property | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) property | Dec. 31, 2017 USD ($) property properties | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Jan. 31, 2018 properties
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost method investments |  |  |  |  |  | $ 556,000 |  |  |  |  | $ 556,000 | $ 957,000 |  |
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  |  | 23,371,000 | 39,449,000 | $ 37,330,000 |
Mervyns I and Mervyns II |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution from equity method investment |  |  |  |  |  |  |  |  |  |  | 1,100,000 |  |  |
Equity method investments |  |  |  |  |  | 0 |  |  |  |  | 0 |  |  |
Albertson's |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution from cost method investment |  |  |  |  |  |  |  |  |  |  | 2,400,000 |  |  |
Cost method investments |  |  |  |  |  | 0 |  |  |  |  | 0 |  |  |
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |
Fund IV |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  | 82,143,000 |  |  |  |  | 82,143,000 | 95,498,000 |  |
Fund III |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 373,000 |  |  |  |  | $ 373,000 | $ 8,349,000 |  |
Broughton St. Portfolio Savannah, GA | Fund IV |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of retail properties | properties |  |  |  |  |  | 18 |  |  |  |  | 18 |  |  |
Disposed of by sale |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  | $ 35,900,000 |  | $ 13,000,000 | $ 3,300,000 | $ 14,500,000 |  |  |  |
Number of retail properties | property |  |  |  |  |  | 3 |  | 2 |  | 2 | 3 |  |  |
Disposed of by sale | Cortlandt Towne Center |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration received |  |  | $ 57,800,000 | $ 107,300,000 |  |  |  |  |  |  |  |  |  |
Proceeds from sale of equity method investments |  |  | 25,200,000 |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  | $ 36,000,000 | $ 65,400,000 |  |  |  |  |  |  |  |  |  |
Percentage of disposition |  |  | 35.00% | 65.00% |  |  |  |  |  |  |  |  |  |
Disposed of by sale | Cortlandt Towne Center | Mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  | $ 32,600,000 |  |  |  |  |  |  |  |  |  |  |
Disposed of by sale | Partnership Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  |  |  |  | 800,000 | $ 2,700,000 |  |  |  |
Disposed of by sale | Partnership Interest | Cortlandt Towne Center |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  | $ 8,800,000 |  |  |  |  |  |  |  |  |  |  |
Disposed of by sale | 2819 Kennedy Boulevard | Fund IV |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration received |  |  |  |  | $ 19,000,000 |  |  |  |  |  |  |  |  |
Proceeds from sale of equity method investments |  |  |  |  | 10,600,000 |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  | 6,300,000 |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration received |  | $ 28,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of equity method investments |  | 18,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  | 8,200,000 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of equity method investments |  |  |  |  |  |  | $ 11,000,000 |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  |  | $ 1,200,000 |  |  |  |  |  |  |
Number of retail properties | properties |  |  |  |  |  |  | 5 |  |  |  |  |  |  |
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 |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |
Subsequent Event | Disposed of by sale | Broughton St. Portfolio Savannah, GA | Fund IV |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of retail properties | properties |  |  |  |  |  |  |  |  |  |  |  |  |  | 2

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