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Real Estate - Acquisitions (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |
Purchase Price | $ 149,732 |  | $ 756,842
Debt assumed | 0 |  | 120,672
Acquisition related costs | 900 | $ 5,500 |
Purchase Price Allocation |  |  |
Land | 21,917 |  | 225,729
Buildings and improvements | 104,729 |  | 458,525
Other assets | 0 |  | 3,481
Acquisition-related intangible assets (in Acquired lease intangibles, net) | 31,378 |  | 63,606
Acquisition-related intangible liabilities (in Acquired lease intangibles, net) | (8,292) |  | (72,985)
Above and below market debt assumed (included in Mortgages and other notes payable, net) | 0 |  | (119,601)
Net assets acquired | 149,732 |  | 558,755
Consideration: |  |  |
Cash | 138,429 |  | 439,546
Conversion of note receivable | 9,142 |  | 0
Debt assumed | 0 |  | 120,672
Liabilities assumed | 2,161 |  | 0
Total Consideration | 149,732 |  | 558,755
Core Portfolio and Opportunity Funds |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition related costs | 900 | 5,500 |
Core Portfolio |  |  |
Business Acquisition [Line Items] |  |  |
Purchase Price |  |  | 519,592
Debt assumed | 0 |  | 119,209
Acquisition related costs | 300 | 5,100 |
Consideration: |  |  |
Debt assumed | 0 |  | $ 119,209
Core Portfolio | 991 Madison Avenue - New York, NY | New York, NY |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired |  |  | 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%
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%
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%
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%
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%
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%
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%
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%
Purchase Price |  |  | $ 139,775
Debt assumed |  |  | 60,000
Consideration: |  |  |
Debt assumed |  |  | 60,000
Funds Segment |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition related costs | 600 | $ 400 |
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% |  |
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% |  |
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%
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%
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%
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%
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%
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%
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%
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%
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%
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%
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%
Purchase Price |  |  | $ 103,500
Debt assumed |  |  | 0
Consideration: |  |  |
Debt assumed |  |  | $ 0
Fund V |  |  |
Business Acquisition [Line Items] |  |  |
Purchase Price | 105,240 |  |
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% |  |
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% |  |
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% |  |
Purchase Price | $ 26,000 |  |
Debt assumed | 0 |  |
Consideration: |  |  |
Debt assumed | $ 0 |  |

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