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Investments in and Advances to Unconsolidated Affiliates - Schedule of Investments (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |
Due from related parties | $ 2,254 | $ 2,415
Other | 556 | 556
Investments in and advances to unconsolidated affiliates | 311,540 | 302,070
Distributions in excess of income from, and investments in, unconsolidated affiliates | $ 15,226 | 15,292
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 | $ 161 | 167
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 | $ 367 | 373
Broughton St. Portfolio Savannah, GA |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment, ownership percentage | 50.00% |
Equity method investments | $ 41,331 | 48,335
Cumulative capital contribution, percentage | 15.00% |
Cumulative capital contribution | $ 15,700 | 15,400
Preferred return percentage | 9.00% |
Preferred return | $ 30,200 | 36,800
Fund IV Other Portfolio |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment, ownership percentage | 90.00% |
Equity method investments | $ 16,101 | 20,199
650 Bald Hill Road |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment, ownership percentage | 90.00% |
Equity method investments | $ 13,506 | 13,609
Fund IV |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments | 70,938 | 82,143
Core Portfolio |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments | $ 237,425 | 216,583
Core Portfolio | 840 N. Michigan |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment, ownership percentage | 88.43% |
Equity method investments | $ 69,265 | 69,846
Core Portfolio | Renaissance Portfolio |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment, ownership percentage | 20.00% |
Equity method investments | $ 34,294 | 35,041
Core Portfolio | Gotham Plaza |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment, ownership percentage | 49.00% |
Equity method investments | $ 29,408 | 29,416
Core Portfolio | Town Center |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment, ownership percentage | 75.22% |
Equity method investments | $ 100,918 | 78,801
Core Portfolio | Georgetown Portfolio |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment, ownership percentage | 50.00% |
Equity method investments | $ 3,540 | 3,479
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 | $ 15,226 | $ 15,292

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