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Unconsolidated Affiliates and Noncontrolling Interests - Narrative (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Apr. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) holder entity shares | Mar. 31, 2018 shares | Jun. 30, 2018 entity shares | Jun. 30, 2017 shares
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of equity method investment entities |  | 18 |  | 18 |
Number of joint ventures |  | 13 |  | 13 |
Gain on investment related to land contributed to joint venture | $ | $ 387 |  |  |  |
Cash paid upon conversion of common units | $ |  | $ 2,246 |  |  |
Number of holders of common units | holder |  | 2 |  |  |
Issuances of common units (shares) | shares |  |  |  | 709,113 | 336,475
Number of variable interest entities |  |  |  | 19 |
Ownership in variable interest entity (as a percent) |  |  |  | 50.00% |
Minimum |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity interest in real estate property (as a percent) |  | 10.00% |  | 10.00% |
Maximum |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity interest in real estate property (as a percent) |  | 65.00% |  | 65.00% |
Ownership in variable interest entity (as a percent) |  |  |  | 95.00% |
Unconsolidated Properties |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Issuances of common units (shares) | shares |  | 526,510 | 915,338 |  |

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