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Real Estate - Dispositions (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2016 | Mar. 31, 2016 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015
Fund III [Member] | Cortlandt Towne Center [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain on Sale |  | $ 65,400 |  |  |  |
Fund III [Member] | Heritage Shops [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain on Sale | $ 16,600 |  |  |  |  |
Fund III [Member] | Lincoln Park Centre [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain on Sale |  |  |  | $ 27,100 |  |
Fund II [Member] | Liberty Avenue [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain on Sale |  |  | $ 12,000 |  |  |
Fund II [Member] | City Point - Air Rights [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain on Sale |  |  | $ 49,900 |  |  |
Disposal Group, Not Discontinued Operations [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Sales Price |  |  |  |  | $ 153,750 | $ 203,878
Gain on Sale |  |  |  |  | 81,965 | 89,063
Disposal Group, Not Discontinued Operations [Member] | 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 |
Disposal Group, Not Discontinued Operations [Member] | 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 |
Disposal Group, Not Discontinued Operations [Member] | Fund III [Member] | Lincoln Park Centre [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Sales Price |  |  |  |  |  | 64,000
Gain on Sale |  |  |  |  |  | 27,143
Disposal Group, Not Discontinued Operations [Member] | Fund II [Member] | Liberty Avenue [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Sales Price |  |  |  |  |  | 24,000
Gain on Sale |  |  |  |  |  | 11,957
Disposal Group, Not Discontinued Operations [Member] | Fund II [Member] | City Point - Air Rights [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Sales Price |  |  |  |  |  | 115,600
Gain on Sale |  |  |  |  |  | 49,884
Disposal Group, Not Discontinued Operations [Member] | Fund I [Member] | Kroger Safeway Various [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Sales Price |  |  |  |  |  | 278
Gain on Sale |  |  |  |  |  | $ 79

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