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Real Estate - Acquisitions and Conversions (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchase Price |  |  |  |  |  |  |  |  | $ 254,532 | $ 756,842 |
Debt assumed |  |  |  |  |  |  |  |  | 0 | 120,672 |
Acquisition related costs |  |  |  |  |  |  |  |  | 2,100 | 8,200 |
Revenues | $ 66,081 | $ 62,678 | $ 59,504 | $ 61,999 | $ 54,121 | $ 43,855 | $ 43,918 | $ 48,045 | 250,262 | 189,939 | $ 199,063
Net loss | $ 24,944 | $ 13,285 | $ 6,108 | $ 19,971 | $ 34,236 | $ 326 | $ 26,155 | $ 73,875 | 64,308 | 134,592 | 149,970
Loss per share (in dollars per share) | $ 0.25 | $ 0.15 | $ 0.14 | $ 0.18 | $ 0.24 | $ 0.08 | $ 0.24 | $ 0.40 |  |  |
Purchase Price Allocation |  |  |  |  |  |  |  |  |  |  |
Land | $ 48,138 |  |  |  | $ 225,729 |  |  |  | 48,138 | 225,729 |
Buildings and improvements | 173,576 |  |  |  | 458,525 |  |  |  | 173,576 | 458,525 |
Other assets | 84 |  |  |  | 3,481 |  |  |  | 84 | 3,481 |
Acquisition-related intangible assets (in Acquired lease intangibles, net) | 44,269 |  |  |  | 63,606 |  |  |  | 44,269 | 63,606 |
Acquisition-related intangible liabilities (in Acquired lease intangibles, net) | (11,535) |  |  |  | (72,985) |  |  |  | (11,535) | (72,985) |
Above and below market debt assumed (included in Mortgages and other notes payable, net) | 0 |  |  |  | (119,601) |  |  |  | 0 | (119,601) |
Net assets acquired | $ 254,532 |  |  |  | $ 558,755 |  |  |  | 254,532 | 558,755 |
Consideration |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  |  |  | 200,429 | 439,546 |
Conversion of note receivable |  |  |  |  |  |  |  |  | 41,010 | 0 |
Debt assumed |  |  |  |  |  |  |  |  | 0 | 120,672 |
Liabilities assumed |  |  |  |  |  |  |  |  | 3,363 | 0 |
Existing interest in previously unconsolidated investment |  |  |  |  |  |  |  |  | 4,159 | 0 |
Change in control of previously unconsolidated investment |  |  |  |  |  |  |  |  | 5,571 | 0 | $ 0
Total Consideration |  |  |  |  |  |  |  |  | 254,532 | 558,755 |
2017 Acquisitions |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 10,200 |  |
Net loss |  |  |  |  |  |  |  |  | $ 3,500 |  |
Loss per share (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.04 |  |
2016 Acquisitions |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 15,300 |
Net loss |  |  |  |  |  |  |  |  |  | $ 4,700 |
Loss per share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.06 |
Core Portfolio and Opportunity Funds |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  |  |  |  | $ 2,100 | $ 8,200 |
Core Portfolio |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchase Price |  |  |  |  |  |  |  |  | 42,800 | 519,592 |
Debt assumed |  |  |  |  |  |  |  |  | 0 | 119,209 |
Acquisition related costs |  |  |  |  |  |  |  |  | 1,200 | 5,500 |
Consideration |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  | $ 0 | $ 119,209 |
Core Portfolio | Market Square Shopping Center | Wilmington, DE |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent Acquired | 100.00% |  |  |  |  |  |  |  | 100.00% |  |
Purchase Price |  |  |  |  |  |  |  |  | $ 42,800 |  |
Debt assumed |  |  |  |  |  |  |  |  | 0 |  |
Consideration |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  | 0 |  |
Core Portfolio | 991 Madison Avenue - New York, NY | New York, NY |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent Acquired |  |  |  |  | 100.00% |  |  |  |  | 100.00% |
Purchase Price |  |  |  |  |  |  |  |  |  | $ 76,628 |
Debt assumed |  |  |  |  |  |  |  |  |  | 0 |
Consideration |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  |  | $ 0 |
Core Portfolio | 165 Newbury Street - Boston, MA | Boston, MA |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent Acquired |  |  |  |  | 100.00% |  |  |  |  | 100.00% |
Purchase Price |  |  |  |  |  |  |  |  |  | $ 6,250 |
Debt assumed |  |  |  |  |  |  |  |  |  | 0 |
Consideration |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  |  | $ 0 |
Core Portfolio | Concord & Milwaukee - Chicago, IL | Chicago, IL |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent Acquired |  |  |  |  | 100.00% |  |  |  |  | 100.00% |
Purchase Price |  |  |  |  |  |  |  |  |  | $ 6,000 |
Debt assumed |  |  |  |  |  |  |  |  |  | 2,902 |
Consideration |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  |  | $ 2,902 |
Core Portfolio | 151 North State Street - Chicago, IL | Chicago, IL |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent Acquired |  |  |  |  | 100.00% |  |  |  |  | 100.00% |
Purchase Price |  |  |  |  |  |  |  |  |  | $ 30,500 |
Debt assumed |  |  |  |  |  |  |  |  |  | 14,556 |
Consideration |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  |  | $ 14,556 |
Core Portfolio | State & Washington - Chicago, IL | Chicago, IL |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent Acquired |  |  |  |  | 100.00% |  |  |  |  | 100.00% |
Purchase Price |  |  |  |  |  |  |  |  |  | $ 70,250 |
Debt assumed |  |  |  |  |  |  |  |  |  | 25,650 |
Consideration |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  |  | $ 25,650 |
Core Portfolio | North & Kingsbury - Chicago, IL | Chicago, IL |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent Acquired |  |  |  |  | 100.00% |  |  |  |  | 100.00% |
Purchase Price |  |  |  |  |  |  |  |  |  | $ 34,000 |
Debt assumed |  |  |  |  |  |  |  |  |  | 13,409 |
Consideration |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  |  | $ 13,409 |
Core Portfolio | Sullivan Center - Chicago, IL | Chicago, IL |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent Acquired |  |  |  |  | 100.00% |  |  |  |  | 100.00% |
Purchase Price |  |  |  |  |  |  |  |  |  | $ 146,939 |
Debt assumed |  |  |  |  |  |  |  |  |  | 0 |
Consideration |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  |  | $ 0 |
Core Portfolio | California & Armitage - Chicago, IL | Chicago, IL |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent Acquired |  |  |  |  | 100.00% |  |  |  |  | 100.00% |
Purchase Price |  |  |  |  |  |  |  |  |  | $ 9,250 |
Debt assumed |  |  |  |  |  |  |  |  |  | 2,692 |
Consideration |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  |  | $ 2,692 |
Core Portfolio | 555 9th Street - San Francisco, CA | San Francisco, CA |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent Acquired |  |  |  |  | 100.00% |  |  |  |  | 100.00% |
Purchase Price |  |  |  |  |  |  |  |  |  | $ 139,775 |
Debt assumed |  |  |  |  |  |  |  |  |  | 60,000 |
Consideration |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  |  | 60,000 |
Funds Segment |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  |  |  |  | 900 | 2,700 |
Fund IV |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchase Price |  |  |  |  |  |  |  |  | 44,492 | 237,250 |
Debt assumed |  |  |  |  |  |  |  |  | 0 | 1,463 |
Consideration |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  | $ 0 | $ 1,463 |
Fund IV | Lincoln Place - Fairview Heights, IL | Fairview Heights, IL |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent Acquired | 100.00% |  |  |  |  |  |  |  | 100.00% |  |
Purchase Price |  |  |  |  |  |  |  |  | $ 35,350 |  |
Debt assumed |  |  |  |  |  |  |  |  | 0 |  |
Consideration |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  | $ 0 |  |
Fund IV | Shaw's Plaza Waterville, ME | Windham, ME |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent Acquired | 100.00% |  |  |  |  |  |  |  | 100.00% |  |
Purchase Price |  |  |  |  |  |  |  |  | $ 9,142 |  |
Debt assumed |  |  |  |  |  |  |  |  | 0 |  |
Consideration |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  | 0 |  |
Fund IV | Shaw's Plaza Waterville, ME | Waterville, ME |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent Acquired |  |  |  |  | 100.00% |  |  |  |  | 100.00% |
Purchase Price |  |  |  |  |  |  |  |  |  | $ 13,800 |
Debt assumed |  |  |  |  |  |  |  |  |  | 0 |
Consideration |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  |  | $ 0 |
Fund IV | Restaurants at Fort Point - Boston, MA | Boston, MA |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent Acquired |  |  |  |  | 100.00% |  |  |  |  | 100.00% |
Purchase Price |  |  |  |  |  |  |  |  |  | $ 11,500 |
Debt assumed |  |  |  |  |  |  |  |  |  | 0 |
Consideration |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  |  | $ 0 |
Fund IV | 1964 Union Street San Francisco, CA | San Francisco, CA |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent Acquired |  |  |  |  | 90.00% |  |  |  |  | 90.00% |
Purchase Price |  |  |  |  |  |  |  |  |  | $ 2,250 |
Debt assumed |  |  |  |  |  |  |  |  |  | 1,463 |
Consideration |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  |  | $ 1,463 |
Fund IV | Wake Forest Crossing - Wake Forest, NC | Wake Forest, NC |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent Acquired |  |  |  |  | 100.00% |  |  |  |  | 100.00% |
Purchase Price |  |  |  |  |  |  |  |  |  | $ 36,600 |
Debt assumed |  |  |  |  |  |  |  |  |  | 0 |
Consideration |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  |  | $ 0 |
Fund IV | Airport Mall - Bangor, ME | Bangor, ME |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent Acquired |  |  |  |  | 100.00% |  |  |  |  | 100.00% |
Purchase Price |  |  |  |  |  |  |  |  |  | $ 10,250 |
Debt assumed |  |  |  |  |  |  |  |  |  | 0 |
Consideration |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  |  | $ 0 |
Fund IV | Colonie Plaza - Albany, NY | Albany, NY |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent Acquired |  |  |  |  | 100.00% |  |  |  |  | 100.00% |
Purchase Price |  |  |  |  |  |  |  |  |  | $ 15,000 |
Debt assumed |  |  |  |  |  |  |  |  |  | 0 |
Consideration |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  |  | $ 0 |
Fund IV | Dauphin Plaza - Harrisburg, PA | Harrisburg, PA |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent Acquired |  |  |  |  | 100.00% |  |  |  |  | 100.00% |
Purchase Price |  |  |  |  |  |  |  |  |  | $ 16,000 |
Debt assumed |  |  |  |  |  |  |  |  |  | 0 |
Consideration |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  |  | $ 0 |
Fund IV | JFK Plaza - Waterville, ME | Waterville, ME |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent Acquired |  |  |  |  | 100.00% |  |  |  |  | 100.00% |
Purchase Price |  |  |  |  |  |  |  |  |  | $ 6,500 |
Debt assumed |  |  |  |  |  |  |  |  |  | 0 |
Consideration |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  |  | $ 0 |
Fund IV | Mayfair Shopping Center - Philadelphia, PA | Philadelphia, PA |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent Acquired |  |  |  |  | 100.00% |  |  |  |  | 100.00% |
Purchase Price |  |  |  |  |  |  |  |  |  | $ 16,600 |
Debt assumed |  |  |  |  |  |  |  |  |  | 0 |
Consideration |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  |  | $ 0 |
Fund IV | Wells Plaza - Wells, ME | Wells, ME |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent Acquired |  |  |  |  | 100.00% |  |  |  |  | 100.00% |
Purchase Price |  |  |  |  |  |  |  |  |  | $ 5,250 |
Debt assumed |  |  |  |  |  |  |  |  |  | 0 |
Consideration |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  |  | $ 0 |
Fund IV | 717 N Michigan - Chicago, IL | Chicago, IL |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent Acquired |  |  |  |  | 100.00% |  |  |  |  | 100.00% |
Purchase Price |  |  |  |  |  |  |  |  |  | $ 103,500 |
Debt assumed |  |  |  |  |  |  |  |  |  | 0 |
Consideration |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  |  | $ 0 |
Fund V |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchase Price |  |  |  |  |  |  |  |  | 167,240 |  |
Debt assumed |  |  |  |  |  |  |  |  | 0 |  |
Consideration |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  | $ 0 |  |
Fund V | Plaza Santa Fe - Santa Fe, NM | Santa Fe, NM |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent Acquired | 100.00% |  |  |  |  |  |  |  | 100.00% |  |
Purchase Price |  |  |  |  |  |  |  |  | $ 35,220 |  |
Debt assumed |  |  |  |  |  |  |  |  | 0 |  |
Consideration |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  | $ 0 |  |
Fund V | Hickory Ridge - Hickory, NC | Hickory, NC |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent Acquired | 100.00% |  |  |  |  |  |  |  | 100.00% |  |
Purchase Price |  |  |  |  |  |  |  |  | $ 44,020 |  |
Debt assumed |  |  |  |  |  |  |  |  | 0 |  |
Consideration |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  | $ 0 |  |
Fund V | New Towne Plaza - Canton, MI | Canton, MI |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent Acquired | 100.00% |  |  |  |  |  |  |  | 100.00% |  |
Purchase Price |  |  |  |  |  |  |  |  | $ 26,000 |  |
Debt assumed |  |  |  |  |  |  |  |  | 0 |  |
Consideration |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  | $ 0 |  |
Fund V | Fairlane Green | Allen Park, MI |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent Acquired | 100.00% |  |  |  |  |  |  |  | 100.00% |  |
Purchase Price |  |  |  |  |  |  |  |  | $ 62,000 |  |
Debt assumed |  |  |  |  |  |  |  |  | 0 |  |
Consideration |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  | $ 0 |  |

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