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Real Estate - Dispositions (Details) - Disposal Group, Not Discontinued Operations - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Sales Price | $ 52,654 | $ 153,750
Gain on Sale | 12,972 | 81,965
Fund II | Heritage Shops |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Sales Price | 30,579 |
Gain on Sale | 6,539 |
Fund III | Cortlandt Towne Center |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Sales Price | 22,075 | 107,250
Gain on Sale | $ 6,433 | 65,393
Fund III | Heritage Shops |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Sales Price |  | 46,500
Gain on Sale |  | $ 16,572

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