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Real Estate - Schedule of Acquisitions and Conversions (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |
Purchase Price | $ 186,463 | $ 254,532
Core Portfolio |  |
Business Acquisition [Line Items] |  |
Purchase Price | $ 1,337 | $ 42,800
Core Portfolio | Bedford Green Land Parcel | Bedford Hills, NY |  |
Business Acquisition [Line Items] |  |
Percent Acquired | 100.00% |
Purchase Price | $ 1,337 |
Core Portfolio | Market Square Shopping Center | Wilmington, DE |  |
Business Acquisition [Line Items] |  |
Percent Acquired |  | 100.00%
Purchase Price |  | $ 42,800
Fund IV |  |
Business Acquisition [Line Items] |  |
Purchase Price | $ 36,104 | $ 44,492
Fund IV | Broughton Street Partners I | Savannah, GA (Conversion) |  |
Business Acquisition [Line Items] |  |
Percent Acquired | 100.00% |
Purchase Price | $ 36,104 |
Fund IV | Lincoln Place - Fairview Heights, IL | Fairview Heights, IL |  |
Business Acquisition [Line Items] |  |
Percent Acquired |  | 100.00%
Purchase Price |  | $ 35,350
Fund IV | Shaw's Plaza Waterville, ME | Windham, ME |  |
Business Acquisition [Line Items] |  |
Percent Acquired |  | 100.00%
Purchase Price |  | $ 9,142
Fund V |  |
Business Acquisition [Line Items] |  |
Purchase Price | $ 149,022 | $ 167,240
Fund V | Trussville Promenade - Trussville, AL | Trussville, AL |  |
Business Acquisition [Line Items] |  |
Percent Acquired | 100.00% |
Purchase Price | $ 45,259 |
Fund V | Elk Grove Commons - Elk Grove, CA | Elk Grove, CA |  |
Business Acquisition [Line Items] |  |
Percent Acquired | 100.00% |
Purchase Price | $ 59,320 |
Fund V | Hiram Pavilion | Hiram, GA |  |
Business Acquisition [Line Items] |  |
Percent Acquired | 100.00% |
Purchase Price | $ 44,443 |
Fund V | Plaza Santa Fe - Santa Fe, NM | Santa Fe, NM |  |
Business Acquisition [Line Items] |  |
Percent Acquired |  | 100.00%
Purchase Price |  | $ 35,220
Fund V | Hickory Ridge - Hickory, NC | Hickory, NC |  |
Business Acquisition [Line Items] |  |
Percent Acquired |  | 100.00%
Purchase Price |  | $ 44,020
Fund V | New Towne Plaza - Canton, MI | Canton, MI |  |
Business Acquisition [Line Items] |  |
Percent Acquired |  | 100.00%
Purchase Price |  | $ 26,000
Fund V | Fairlane Green | Allen Park, MI |  |
Business Acquisition [Line Items] |  |
Percent Acquired |  | 100.00%
Purchase Price |  | $ 62,000

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