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Real Estate - Dispositions (Details) - Disposal Group, Not Discontinued Operations [Member] $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
Sales Price | $ 153,750
Gain on Sale | 81,965
Fund III [Member] | Cortlandt Towne Center [Member] |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
Sales Price | 107,250
Gain on Sale | 65,393
Fund III [Member] | Heritage Shops [Member] |
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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