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Investments in and Advances to Unconsolidated Affiliates - Fund Investments (Details) - USD ($) |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2017 | Feb. 15, 2017 | Dec. 21, 2016 | Jan. 28, 2016 | Jul. 31, 2017 | Jan. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost method investments |  |  |  |  |  |  | $ 556,000 |  | $ 556,000 |  | $ 957,000
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  | 4,001,000 | $ (102,000) | 21,044,000 | $ 3,592,000 |
Mervyns I and Mervyns II |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Distribution from equity method investment |  |  |  |  | $ 1,000,000 |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  | 0 |  | 0 |  |
Albertson's |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Distribution from cost method investment |  |  |  |  | $ 2,300,000 |  |  |  |  |  |
Cost method investments |  |  |  |  |  |  | 0 |  | 0 |  |
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  | 1,900,000 |  |  |  |
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% |  |  |  |  |  |  |
Cortlandt Towne Center | Mortgages |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  | $ 32,600,000 |  |  |  |  |  |  |  |
Fund IV |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  | 91,402,000 |  | 91,402,000 |  | 95,498,000
Fund III |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  | $ 409,000 |  | $ 409,000 |  | $ 8,349,000
Partnership Interest | Cortlandt Towne Center |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  | $ 8,800,000 |  |  |  |  |  |  |  |
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 |  |  |  |  |
2819 Kennedy Boulevard | Fund IV | Mortgages |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  | 8,400,000 |  |  |  |  |
2819 Kennedy Boulevard | Affiliated Entity | Fund IV |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  | 6,200,000 |  |  |  |  |
2819 Kennedy Boulevard | Partnership Interest | Fund IV |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  | $ 1,400,000 |  |  |  |  |
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 |  |  |  |  |  |  |  |  |
Arundel Plaza | Fund III | Mortgages |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  | 10,000,000 |  |  |  |  |  |  |  |  |
Arundel Plaza | Affiliated Entity | Fund III |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  | 5,300,000 |  |  |  |  |  |  |  |  |
Arundel Plaza | Partnership Interest | Fund III |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  | $ 1,300,000 |  |  |  |  |  |  |  |  |
1701 Belmont Avenue | Fund IV |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consideration received | $ 5,600,000 |  |  |  |  |  |  |  |  |  |
Proceeds from sale of equity method investments | 2,700,000 |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal | 3,300,000 |  |  |  |  |  |  |  |  |  |
1701 Belmont Avenue | Fund IV | Mortgages |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of debt | 2,900,000 |  |  |  |  |  |  |  |  |  |
1701 Belmont Avenue | Affiliated Entity | Fund IV |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal | 3,300,000 |  |  |  |  |  |  |  |  |  |
1701 Belmont Avenue | Partnership Interest | Fund IV |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal | $ 800,000 |  |  |  |  |  |  |  |  |  |

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