Real Estate - Schedule of Property Dispositions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on Sale	$ 8,885	$ 0	$ 49,916	$ 10,521
Disposed of by sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale Price			192,703		$ 66,325	[1]
Gain on Sale			$ 49,916		$ 9,787	[1]
Core Portfolio | Disposed of by sale | 60 Orange St - Bloomfield, NJ.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold					Jan. 29, 2021
Sale Price					$ 16,400
Gain on Sale					$ 4,612
Fund IV | Disposed of by sale | NE Grocer Portfolio (Selected Assets) - Pennsylvania
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold			Jan. 26, 2022
Sale Price			$ 45,350
Gain on Sale			$ 13,784
Fund IV | Disposed of by sale | NE Grocer Portfolio (Selected Assets) - Maine
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold					Jun. 18, 2021
Sale Price					$ 39,925
Gain on Sale					$ 5,064
Fund IV | Disposed of by sale | Lincoln Place Fairview Heights, IL
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold			May 25, 2022
Sale Price			$ 40,670
Gain on Sale			$ 12,216
Fund IV | Disposed of by sale | Wake Forest Crossing - Wake Forest, NC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold			Aug. 24, 2022
Sale Price			$ 38,919
Gain on Sale			$ 8,885
Fund III | Disposed of by sale | Cortlandt Crossing - Westchester County, New York
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold			Feb. 09, 2022
Sale Price			$ 65,533
Gain on Sale			$ 13,255
Fund III | Disposed of by sale | 654 Broadway - New York, NY
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold					May 19, 2021
Sale Price					$ 10,000
Gain on Sale					$ 111
Fund V | Disposed of by sale | New Towne (Parcel) - Canton, MI
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold			Feb. 01, 2022
Sale Price			$ 2,231
Gain on Sale			$ 1,776

[1] Does not include the gain on lease termination of $0.7 million related to the Fund IV lease at 110 University Place (Note 11).