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Investments in and Advances to Unconsolidated Affiliates - Schedule of Investments (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018 | Mar. 28, 2018 | Nov. 16, 2017
--- | --- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |  |
Due from related parties | $ (1,477) | $ (461) |  |
Other | 556 | 556 |  |
Investments in and advances to unconsolidated affiliates | 320,477 | 262,410 |  |
Distributions in excess of income from, and investments in, unconsolidated affiliates | $ 15,032 | 15,623 |  |
KLA Mervyns LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 10.50% |  |  |
Equity method investments | $ 0 | 0 |  |
Fund III Other Portfolio |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 90.00% |  |  |
Equity method investments | $ 17 | 21 |  |
Self Storage Management |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 95.00% |  |  |
Equity method investments | $ 206 | 206 |  |
Fund III |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investments | $ 223 | 227 |  |
Broughton St. Portfolio Savannah, GA |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 50.00% |  |  |
Equity method investments | $ 12,579 | 3,236 |  |
Fund IV Other Portfolio |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 90.00% |  |  |
Equity method investments | $ 14,433 | 14,540 |  |
650 Bald Hill Road |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 90.00% |  |  |
Equity method investments | $ 12,557 | 12,880 |  |
Fund IV |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investments | $ 39,569 | 30,656 |  |
Fund V Family Center at Riverdale |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 90.00% |  |  |
Equity method investments | $ 14,514 | $ 0 |  |
Tri City Plaza |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 90.00% |  |  |
Equity method investments | $ 36,636 |  |  |
Fund V |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investments | $ 51,150 |  |  |
Core Portfolio |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 75.22% | 61.11% |  | 22.22%
Equity method investments | $ 230,456 | $ 231,432 | $ 22,300 | $ 61,600
Core Portfolio | Renaissance Portfolio |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 20.00% |  |  |
Equity method investments | $ 32,675 | 32,458 |  |
Core Portfolio | Gotham Plaza |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 49.00% |  |  |
Equity method investments | $ 29,546 | 29,550 |  |
Core Portfolio | Town Center |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 75.22% |  |  |
Equity method investments | $ 98,805 | 99,758 |  |
Core Portfolio | Georgetown Portfolio |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 50.00% |  |  |
Equity method investments | $ 4,808 | 4,653 |  |
Core Portfolio | 840 N. Michigan |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 88.43% |  |  |
Equity method investments | $ 64,622 | 65,013 |  |
Core Portfolio | Crossroads |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 49.00% |  |  |
Distributions in excess of income from, and investments in, unconsolidated affiliates | $ 15,032 | $ 15,623 |  |

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