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Real Estate - Acquisitions (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |
Purchase Price | $ 756,842 | $ 451,220 |
Debt Assumed | 120,672 | 91,885 |
Acquisition related costs | 8,200 | 4,800 |
Consideration: |  |  |
Debt Assumed | (120,672) | (91,885) |
Purchase Price | 756,842 | 451,220 |
Core Portfolio [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Purchase Price | 519,592 | 204,243 |
Debt Assumed | 119,209 | 9,765 |
Acquisition related costs | 5,500 | 1,300 | $ 4,800
Consideration: |  |  |
Debt Assumed | (119,209) | (9,765) |
Purchase Price | 519,592 | 204,243 |
Fund IV [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Purchase Price | 237,250 | 146,177 |
Debt Assumed | 1,463 | 1,120 |
Acquisition related costs | 2,700 | 3,500 | 2,700
Consideration: |  |  |
Debt Assumed | (1,463) | (1,120) |
Purchase Price | $ 237,250 | $ 146,177 |
Fund III [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition related costs |  |  | $ 200
991 Madison Avenue [Member] | New York, New York [Member] | Core Portfolio [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired | 100.00% |  |
Purchase Price | $ 76,628 |  |
Debt Assumed | 0 |  |
Consideration: |  |  |
Debt Assumed | 0 |  |
Purchase Price | $ 76,628 |  |
165 Newbury Street [Member] | Boston, Massachusetts [Member] | Core Portfolio [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired | 100.00% |  |
Purchase Price | $ 6,250 |  |
Debt Assumed | 0 |  |
Consideration: |  |  |
Debt Assumed | 0 |  |
Purchase Price | $ 6,250 |  |
Concord and Milwaukee [Member] | Chicago, Illinois [Member] | Core Portfolio [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired | 100.00% |  |
Purchase Price | $ 6,000 |  |
Debt Assumed | 2,902 |  |
Consideration: |  |  |
Debt Assumed | (2,902) |  |
Purchase Price | $ 6,000 |  |
151 North State Street [Member] | Chicago, Illinois [Member] | Core Portfolio [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired | 100.00% |  |
Purchase Price | $ 30,500 |  |
Debt Assumed | 14,556 |  |
Consideration: |  |  |
Debt Assumed | (14,556) |  |
Purchase Price | $ 30,500 |  |
State and Washington [Member] | Chicago, Illinois [Member] | Core Portfolio [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired | 100.00% |  |
Purchase Price | $ 70,250 |  |
Debt Assumed | 25,650 |  |
Consideration: |  |  |
Debt Assumed | (25,650) |  |
Purchase Price | $ 70,250 |  |
North & Kingsbury [Member] | Chicago, Illinois [Member] | Core Portfolio [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired | 100.00% |  |
Purchase Price | $ 34,000 |  |
Debt Assumed | 13,409 |  |
Consideration: |  |  |
Debt Assumed | (13,409) |  |
Purchase Price | $ 34,000 |  |
Sullivan Center [Member] | Chicago, Illinois [Member] | Core Portfolio [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired | 100.00% |  |
Purchase Price | $ 146,939 |  |
Debt Assumed | 0 |  |
Consideration: |  |  |
Debt Assumed | 0 |  |
Purchase Price | $ 146,939 |  |
California and Armitage [Member] | Chicago, Illinois [Member] | Core Portfolio [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired | 100.00% |  |
Purchase Price | $ 9,250 |  |
Debt Assumed | 2,692 |  |
Consideration: |  |  |
Debt Assumed | (2,692) |  |
Purchase Price | $ 9,250 |  |
555 9th Avenue [Member] | San Francisco, California [Member] | Core Portfolio [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired | 100.00% |  |
Purchase Price | $ 139,775 |  |
Debt Assumed | 60,000 |  |
Consideration: |  |  |
Debt Assumed | (60,000) |  |
Purchase Price | $ 139,775 |  |
Restaurant at Fort Point [Member] | Boston, Massachusetts [Member] | Fund IV [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired | 100.00% |  |
Purchase Price | $ 11,500 |  |
Debt Assumed | 0 |  |
Consideration: |  |  |
Debt Assumed | 0 |  |
Purchase Price | $ 11,500 |  |
1964 Union Street [Member] | San Francisco, California [Member] | Fund IV [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired | 90.00% |  |
Purchase Price | $ 2,250 |  |
Debt Assumed | 1,463 |  |
Consideration: |  |  |
Debt Assumed | (1,463) |  |
Purchase Price | $ 2,250 |  |
Wake Forest Crossing [Member] | Wake Forest, NC [Member] | Fund IV [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired | 100.00% |  |
Purchase Price | $ 36,600 |  |
Debt Assumed | 0 |  |
Consideration: |  |  |
Debt Assumed | 0 |  |
Purchase Price | $ 36,600 |  |
Airport Mall [Member] | Bangor, ME [Member] | Fund IV [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired | 100.00% |  |
Purchase Price | $ 10,250 |  |
Debt Assumed | 0 |  |
Consideration: |  |  |
Debt Assumed | 0 |  |
Purchase Price | $ 10,250 |  |
Colonie Plaza [Member] | Albany, NY [Member] | Fund IV [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired | 100.00% |  |
Purchase Price | $ 15,000 |  |
Debt Assumed | 0 |  |
Consideration: |  |  |
Debt Assumed | 0 |  |
Purchase Price | $ 15,000 |  |
Dauphin Plaza [Member] | Harrisburg, PA [Member] | Fund IV [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired | 100.00% |  |
Purchase Price | $ 16,000 |  |
Debt Assumed | 0 |  |
Consideration: |  |  |
Debt Assumed | 0 |  |
Purchase Price | $ 16,000 |  |
JFK Plaza [Member] | Waterville, ME [Member] | Fund IV [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired | 100.00% |  |
Purchase Price | $ 6,500 |  |
Debt Assumed | 0 |  |
Consideration: |  |  |
Debt Assumed | 0 |  |
Purchase Price | $ 6,500 |  |
Mayfair Shopping Center [Member] | Philadelphia, PA [Member] | Fund IV [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired | 100.00% |  |
Purchase Price | $ 16,600 |  |
Debt Assumed | 0 |  |
Consideration: |  |  |
Debt Assumed | 0 |  |
Purchase Price | $ 16,600 |  |
Shaw's Plaza [Member] | Waterville, ME [Member] | Fund IV [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired | 100.00% |  |
Purchase Price | $ 13,800 |  |
Debt Assumed | 0 |  |
Consideration: |  |  |
Debt Assumed | 0 |  |
Purchase Price | $ 13,800 |  |
Wells Plaza [Member] | Wells, ME [Member] | Fund IV [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired | 100.00% |  |
Purchase Price | $ 5,250 |  |
Debt Assumed | 0 |  |
Consideration: |  |  |
Debt Assumed | 0 |  |
Purchase Price | $ 5,250 |  |
717 N Michigan [Member] | Chicago, Illinois [Member] | Fund IV [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired | 100.00% |  |
Purchase Price | $ 103,500 |  |
Debt Assumed | 0 |  |
Consideration: |  |  |
Debt Assumed | 0 |  |
Purchase Price | 103,500 |  |
City Center [Member] | San Francisco, California [Member] | Core Portfolio [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired |  | 100.00% |
Purchase Price |  | $ 155,000 |
Debt Assumed |  | 0 |
Consideration: |  |  |
Debt Assumed |  | 0 |
Purchase Price |  | $ 155,000 |
163 Highland Avenue [Member] | Needham, MA [Member] | Core Portfolio [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired |  | 100.00% |
Purchase Price |  | $ 24,000 |
Debt Assumed |  | 9,765 |
Consideration: |  |  |
Debt Assumed |  | (9,765) |
Purchase Price |  | $ 24,000 |
Route 202 Shopping Center [Member] | Wilmington, DE [Member] | Core Portfolio [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired |  | 100.00% |
Purchase Price |  | $ 5,643 |
Debt Assumed |  | 0 |
Consideration: |  |  |
Debt Assumed |  | 0 |
Purchase Price |  | $ 5,643 |
Roosevelt Galleria [Member] | Chicago, Illinois [Member] | Core Portfolio [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired |  | 100.00% |
Purchase Price |  | $ 19,600 |
Debt Assumed |  | 0 |
Consideration: |  |  |
Debt Assumed |  | 0 |
Purchase Price |  | $ 19,600 |
City Point Tower I [Member] | Brooklyn, New York [Member] | Fund II [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired |  | 95.00% |
Purchase Price |  | $ 100,800 |
Debt Assumed |  | 81,000 |
Consideration: |  |  |
Debt Assumed |  | (81,000) |
Purchase Price |  | $ 100,800 |
1035 Third Avenue [Member] | New York, New York [Member] | Fund IV [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired |  | 100.00% |
Purchase Price |  | $ 51,036 |
Debt Assumed |  | 0 |
Consideration: |  |  |
Debt Assumed |  | 0 |
Purchase Price |  | $ 51,036 |
801 Madison Avenue [Member] | New York, New York [Member] | Fund IV [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired |  | 100.00% |
Purchase Price |  | $ 33,000 |
Debt Assumed |  | 0 |
Consideration: |  |  |
Debt Assumed |  | 0 |
Purchase Price |  | $ 33,000 |
650 Bald Hill Road [Member] | Warwick, RI [Member] | Fund IV [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired |  | 90.00% |
Purchase Price |  | $ 9,216 |
Debt Assumed |  | 0 |
Consideration: |  |  |
Debt Assumed |  | 0 |
Purchase Price |  | $ 9,216 |
2208-2216 Filmore Street [Member] | San Francisco, California [Member] | Fund IV [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired |  | 90.00% |
Purchase Price |  | $ 8,625 |
Debt Assumed |  | 0 |
Consideration: |  |  |
Debt Assumed |  | 0 |
Purchase Price |  | $ 8,625 |
146 Geary Street [Member] | San Francisco, California [Member] | Fund IV [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired |  | 100.00% |
Purchase Price |  | $ 38,000 |
Debt Assumed |  | 0 |
Consideration: |  |  |
Debt Assumed |  | 0 |
Purchase Price |  | $ 38,000 |
2207 Fillmore Street [Member] | San Francisco, California [Member] | Fund IV [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired |  | 90.00% |
Purchase Price |  | $ 2,800 |
Debt Assumed |  | 1,120 |
Consideration: |  |  |
Debt Assumed |  | (1,120) |
Purchase Price |  | $ 2,800 |
1861 Union Street [Member] | San Francisco, California [Member] | Fund IV [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired |  | 90.00% |
Purchase Price |  | $ 3,500 |
Debt Assumed |  | 0 |
Consideration: |  |  |
Debt Assumed |  | 0 |
Purchase Price |  | 3,500 |
Acquisitions in 2016 [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Purchase Price | 558,755 |  |
Debt Assumed | 119,209 |  |
Purchase Price Allocation |  |  |
Land | 225,729 |  |
Buildings and improvements | 458,525 |  |
Other assets | 3,481 |  |
Acquisition-related intangible assets (in Acquired lease intangibles, net) | 63,606 |  |
Acquisition-related intangible liabilities (in Acquired lease intangibles, net) | (72,985) |  |
Above and below market debt assumed (included in Mortgages and other notes payable, net) | (119,601) |  |
Net assets acquired | 558,755 |  |
Consideration: |  |  |
Cash | 677,964 |  |
Debt Assumed | (119,209) |  |
Purchase Price | $ 558,755 |  |
Acquisitions In 2015 [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Purchase Price |  | 331,931 |
Debt Assumed |  | 10,885 |
Purchase Price Allocation |  |  |
Land |  | 88,068 |
Buildings and improvements |  | 244,903 |
Other assets |  | 0 |
Acquisition-related intangible assets (in Acquired lease intangibles, net) |  | 22,660 |
Acquisition-related intangible liabilities (in Acquired lease intangibles, net) |  | (12,094) |
Above and below market debt assumed (included in Mortgages and other notes payable, net) |  | (11,606) |
Net assets acquired |  | 331,931 |
Consideration: |  |  |
Cash |  | 342,816 |
Debt Assumed |  | (10,885) |
Purchase Price |  | 331,931 |
Acquisitions In 2015 [Member] | Previously Reported [Member] |  |  |
Purchase Price Allocation |  |  |
Land |  | 83,890 |
Buildings and improvements |  | 258,926 |
Other assets |  | 0 |
Acquisition-related intangible assets (in Acquired lease intangibles, net) |  | 0 |
Acquisition-related intangible liabilities (in Acquired lease intangibles, net) |  | 0 |
Above and below market debt assumed (included in Mortgages and other notes payable, net) |  | (10,885) |
Net assets acquired |  | 331,931 |
Acquisitions In 2015 [Member] | Adjustment [Member] |  |  |
Purchase Price Allocation |  |  |
Land |  | 4,178 |
Buildings and improvements |  | (14,023) |
Other assets |  | 0 |
Acquisition-related intangible assets (in Acquired lease intangibles, net) |  | 22,660 |
Acquisition-related intangible liabilities (in Acquired lease intangibles, net) |  | (12,094) |
Above and below market debt assumed (included in Mortgages and other notes payable, net) |  | (721) |
Net assets acquired |  | $ 0 |

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