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Investments in and Advances to Unconsolidated Affiliates - Schedule of Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | May 01, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |
Due to related parties | $ 2,343 |  | $ 2,193
Other | 556 |  | 957
Investments in and advances to unconsolidated affiliates | 270,245 |  | 272,028
Distributions in excess of income from, and investments in, unconsolidated affiliates | $ 15,262 |  | 13,691
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 | $ 168 |  | 8,108
Self Storage Management |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 95.00% |  |
Equity method investments | $ 241 |  | 241
Fund III |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investments | $ 409 |  | 8,349
Broughton Street Portfolio |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 50.00% |  |
Equity method investments | $ 57,368 |  | 54,839
Cumulative capital contribution, percentage | 15.00% |  |
Cumulative capital contribution | $ 15,200 |  | 14,500
Preferred return percentage | 9.00% |  |
Preferred return | $ 47,000 |  | 45,400
Fund IV Other Portfolio |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 90.00% |  |
Equity method investments | $ 20,392 |  | 21,817
650 Bald Hill Road |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 90.00% |  |
Equity method investments | $ 13,642 |  | 18,842
Fund IV |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investments | 91,402 |  | 95,498
Core Portfolio |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investments | $ 175,535 |  | 165,031
Core Portfolio | 840 N. Michigan |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 88.43% |  |
Equity method investments | $ 70,859 |  | 74,131
Core Portfolio | Renaissance Portfolio |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 20.00% |  |
Equity method investments | $ 35,139 |  | 36,437
Core Portfolio | Gotham Plaza |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 49.00% |  |
Equity method investments | $ 29,196 |  | 29,421
Core Portfolio | Brandywine Market Square |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 61.11% | 61.11% |
Equity method investments | $ 20,642 | $ 16,600 | 5,469
Core Portfolio | Brandywine Portfolio |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 22.22% |  |
Equity method investments | $ 15,948 |  | 15,286
Core Portfolio | Georgetown Portfolio |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 50.00% |  |
Equity method investments | $ 3,751 |  | 4,287
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 | $ 15,262 |  | $ 13,691

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