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Real Estate - Schedule of Acquisitions and Conversions (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Purchase Price	$ 105,916	$ 254,532
Core Portfolio
Business Acquisition [Line Items]
Purchase Price	$ 1,337	$ 42,800
Core Portfolio | Bedford Green Land Parcel
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 V
Business Acquisition [Line Items]
Purchase Price	$ 104,579	$ 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 | 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
Fund IV
Business Acquisition [Line Items]
Purchase Price		$ 44,492
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

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