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Investments in and Advances to Unconsolidated Affiliates - Schedule of Investments (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 28, 2018 | Nov. 16, 2017
--- | --- | --- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Due to Related Parties | $ (2,960) | $ (1,902) |  |  |
Other | 2,575 | 2,334 |  |  |
Investments in and advances to unconsolidated affiliates | 294,195 | 305,097 |  |  |
Distributions in excess of income from, and investments in, unconsolidated affiliates | $ 15,457 | 15,362 |  |  |
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 | 94.23% |  |  |  |
Equity method investments | $ 17 | 17 |  |  |
Self Storage Management |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage | 95.00% |  |  |  |
Equity method investments | $ 207 | 207 |  |  |
Fund III |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investments | $ 224 | 224 |  |  |
Broughton St. Portfolio Savannah, GA |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage | 50.00% |  |  |  |
Equity method investments | $ 12,764 | 12,702 |  |  |
Fund IV Other Portfolio |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage | 98.57% |  |  |  |
Equity method investments | $ 13,301 | 14,733 |  |  |
650 Bald Hill Road |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage | 90.00% |  |  |  |
Equity method investments | $ 12,346 | 12,450 |  |  |
Fund IV |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investments | $ 38,411 | 39,885 |  |  |
Fund V Family Center at Riverdale |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage | 89.42% |  |  |  |
Equity method investments | $ 11,983 | 13,329 |  |  |
Fund V |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investments | $ 32,857 | 38,649 |  |  |
Tri City Plaza |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage | 90.00% |  |  |  |
Equity method investments | $ 8,412 | 10,250 |  |  |
Frederick County Acquisitions |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage | 90.00% |  |  |  |
Equity method investments | $ 12,462 | 15,070 |  |  |
Core Portfolio |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage | 75.22% |  | 61.11% |  | 22.22%
Equity method investments | $ 223,088 | 225,907 |  | $ 22,300 | $ 61,600
Other | $ 2,000 |  |  |  |
Core Portfolio | Renaissance Portfolio |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage | 20.00% |  |  |  |
Equity method investments | $ 30,947 | 31,815 |  |  |
Core Portfolio | Gotham Plaza |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage | 49.00% |  |  |  |
Equity method investments | $ 28,982 | 29,466 |  |  |
Core Portfolio | Town Center |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage | 75.22% |  |  |  |
Equity method investments | $ 96,816 | 97,674 |  |  |
Core Portfolio | Georgetown Portfolio |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage | 50.00% |  |  |  |
Equity method investments | $ 4,490 | 4,498 |  |  |
Core Portfolio | 1238 Wisconsin Avenue |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage | 80.00% |  |  |  |
Equity method investments | $ 1,848 | 1,194 |  |  |
Core Portfolio | 840 N. Michigan |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage | 88.43% |  |  |  |
Equity method investments | $ 60,005 | 61,260 |  |  |
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 | $ 15,457 | $ 15,362 |  |  |

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