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Real Estate - Schedule of Property Dispositions (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Gain (Loss) on Sale | $ 683 | $ 30,324 | $ 5,140
Disposed of by sale |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Sale Price | 22,413 |  |
Gain (Loss) on Sale | 683 |  |
Disposal Group, Not Discontinued Operations |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Sale Price |  | 109,326 |
Gain (Loss) on Sale | $ 683 | $ 30,324 | $ 5,140
Core Portfolio | Disposed of by sale | 163 Highland Ave. (Easement) - Needham, MA |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date Sold | Mar. 19, 2020 |  |
Sale Price | $ 238 |  |
Gain (Loss) on Sale | $ 88 |  |
Core Portfolio | Disposed of by sale | Union Township (Parcel) - New Castle, PA |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date Sold | Dec. 11, 2020 |  |
Sale Price | $ 200 |  |
Gain (Loss) on Sale | $ 86 |  |
Core Portfolio | Disposal Group, Not Discontinued Operations | Pacesetter Park - Pomona, NY |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date Sold |  | Oct. 28, 2019 |
Sale Price |  | $ 22,550 |
Gain (Loss) on Sale |  | $ 16,771 |
Fund III | Disposed of by sale | Cortlandt Crossing (Sewer Project and Retention Pond) - Cortlandt, NY |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date Sold | Nov. 30, 2020 |  |
Sale Price | $ 6,325 |  |
Fund III | Disposal Group, Not Discontinued Operations | A3104 M St. Washington D C |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date Sold |  | Jan. 24, 2019 |
Sale Price |  | $ 10,500 |
Gain (Loss) on Sale |  | $ 2,014 |
Fund III | Disposal Group, Not Discontinued Operations | 3780-3858 Nostrand Avenue - New York, NY |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date Sold |  | Aug. 22, 2019 |
Sale Price |  | $ 27,650 |
Gain (Loss) on Sale |  | $ 2,562 |
Fund IV | Disposed of by sale | Colonie Plaza - Albany, NY |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date Sold | Apr. 13, 2020 |  |
Sale Price | $ 15,250 |  |
Gain (Loss) on Sale | $ 485 |  |
Fund IV | Disposed of by sale | Airport Mall (Parcel) - Bangor, ME |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date Sold | Sep. 10, 2020 |  |
Sale Price | $ 400 |  |
Gain (Loss) on Sale | $ 24 |  |
Fund IV | Disposal Group, Not Discontinued Operations | 210 Bowery - 3 Residential Condos - New York, NY | Scenario One |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date Sold |  | May 17, 2019 |
Sale Price |  | $ 8,826 |
Gain (Loss) on Sale |  | $ (242) |
Fund IV | Disposal Group, Not Discontinued Operations | 210 Bowery - 3 Residential Condos - New York, NY | Scenario Two |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date Sold |  | Sep. 23, 2019 |
Fund IV | Disposal Group, Not Discontinued Operations | 210 Bowery - 3 Residential Condos - New York, NY | Scenario Three |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date Sold |  | Nov. 07, 2019 |
Fund IV | Disposal Group, Not Discontinued Operations | JFK Plaza - Waterville, ME |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date Sold |  | Jul. 24, 2019 |
Sale Price |  | $ 7,800 |
Gain (Loss) on Sale |  | $ 2,075 |
Fund IV | Disposal Group, Not Discontinued Operations | 938 W North Avenue - Chicago, IL |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Date Sold |  | Sep. 27, 2019 |
Sale Price |  | $ 32,000 |
Gain (Loss) on Sale |  | $ 7,144 |

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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228 + Details
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