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Real Estate - Acquisitions and Conversions (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |
Purchase Price | $ 46,596,000 |  | $ 254,532,000
Debt assumed | 0 |  | 0
Capitalized acquisition costs | 100,000 |  |
Acquisition costs expensed |  | $ 600,000 |
Purchase Price Allocation |  |  |
Land | 8,924,000 |  | 48,138,000
Buildings and improvements | 34,237,000 |  | 173,576,000
Other assets | 0 |  | 84,000
Acquisition-related intangible assets (Note 6) | 6,486,000 |  | 44,269,000
Acquisition-related intangible liabilities (Note 6) | (3,051,000) |  | (11,535,000)
Net assets acquired | 46,596,000 |  | 254,532,000
Consideration |  |  |
Cash | 46,171,000 |  | 200,429,000
Conversion of note receivable | 0 |  | 41,010,000
Liabilities assumed | 425,000 |  | 3,363,000
Existing interest in previously unconsolidated investment | 0 |  | 4,159,000
Change in control of previously unconsolidated investment | 0 |  | 5,571,000
Total Consideration | 46,596,000 |  | 254,532,000
Core Portfolio |  |  |
Business Acquisition [Line Items] |  |  |
Purchase Price | $ 1,337,000 |  | $ 42,800,000
Acquisition costs expensed |  | 200,000 |
Core Portfolio | Bedford Green Land Parcel |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired | 100.00% |  |
Purchase Price | $ 1,337,000 |  |
Core Portfolio | Market Square Shopping Center | Wilmington, DE |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired |  |  | 100.00%
Purchase Price |  |  | $ 42,800,000
Funds Segment |  |  |
Business Acquisition [Line Items] |  |  |
Capitalized acquisition costs | 100,000 |  |
Acquisition costs expensed |  | $ 400,000 |
Fund IV |  |  |
Business Acquisition [Line Items] |  |  |
Purchase Price |  |  | $ 44,492,000
Fund IV | Lincoln Place - Fairview Heights, IL | Fairview Heights, IL |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired |  |  | 100.00%
Purchase Price |  |  | $ 35,350,000
Fund IV | Shaw's Plaza Waterville, ME | Windham, ME |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired |  |  | 100.00%
Purchase Price |  |  | $ 9,142,000
Fund V |  |  |
Business Acquisition [Line Items] |  |  |
Purchase Price | $ 45,259,000 |  | $ 167,240,000
Fund V | Trussville Promenade - Trussville, AL | Trussville, AL |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired | 100.00% |  |
Purchase Price | $ 45,259,000 |  |
Fund V | Plaza Santa Fe - Santa Fe, NM | Santa Fe, NM |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired |  |  | 100.00%
Purchase Price |  |  | $ 35,220,000
Fund V | Hickory Ridge - Hickory, NC | Hickory, NC |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired |  |  | 100.00%
Purchase Price |  |  | $ 44,020,000
Fund V | New Towne Plaza - Canton, MI | Canton, MI |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired |  |  | 100.00%
Purchase Price |  |  | $ 26,000,000
Fund V | Fairlane Green | Allen Park, MI |  |  |
Business Acquisition [Line Items] |  |  |
Percent Acquired |  |  | 100.00%
Purchase Price |  |  | $ 62,000,000

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