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Investments in and Advances to Unconsolidated Affiliates - Fund Investments (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2016 | Jan. 31, 2016 | Sep. 30, 2015 | Apr. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  | 65.00%
Purchase Price |  |  |  |  |  | $ 756,842 | $ 451,220 |
Mortgages [Member] |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  | 292,300 |  |
Fund III [Member] | White City Shopping Center [Member] |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Consideration received |  |  |  | $ 96,800 |  |  |  |
Gain (loss) on disposal |  |  |  | $ 16,200 | $ 17,100 |  |  |
Fund III [Member] | Cortlandt Towne Center [Member] |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Consideration received | $ 57,800 | $ 107,300 |  |  |  | 57,800 |  |
Gain (loss) on disposal | $ 36,000 | $ 65,400 |  |  |  |  |  |
Percentage of disposition | 35.00% | 65.00% |  |  |  |  |  |
Proceeds from sale of equity method investments | $ 25,200 |  |  |  |  |  |  |
Fund III [Member] | Cortlandt Towne Center [Member] | Mortgages [Member] |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Repayments of debt | $ 32,600 |  |  |  |  |  |  |
Fund IV [Member] |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Purchase Price |  |  |  |  |  | $ 237,250 | $ 146,177 |
Fund IV [Member] | 650 Bald Hill Road [Member] |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity method investment, ownership percentage | 90.00% |  | 90.00% |  |  | 90.00% |  |
Purchase Price |  |  | $ 9,200 |  |  |  |  |
Partnership Interest [Member] | Fund III [Member] | Cortlandt Towne Center [Member] |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Gain (loss) on disposal | $ 8,800 |  |  |  |  |  |  |

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