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Investments in Unconsolidated Entities - Narrative (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 13 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2014 USD ($) ft² | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) ft² | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) ft² | Jun. 30, 2019 USD ($) | Sep. 09, 2014
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity contribution |  |  |  | $ 0 | $ 3,264 |  |
Equity in other comprehensive income (loss) of unconsolidated joint venture |  | $ (89) | $ 9 | $ (178) | $ 236 |  |
Heritage Common X |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Area of real estate property (in sqft) | ft² |  |  | 200,000 |  | 200,000 |  |
Total project budget |  |  | $ 48,100 |  | $ 48,100 |  |
Equity method investment, liabilities |  |  | 41,400 |  | 41,400 |  |
Equity contributed by the members of joint venture |  |  | $ 6,700 |  | $ 6,700 |  |
Equity method investment, ownership (percent) |  | 45.00% |  | 45.00% |  | 45.00% |
Equity contribution |  |  |  |  |  | $ 3,100 |
Equity in other comprehensive income (loss) of unconsolidated joint venture |  |  |  | $ 0 |  |  |
Digital Realty Joint Venture |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Area of real estate property (in sqft) | ft² | 132,300 |  |  |  |  |  |
Equity method investment, liabilities | $ 102,000 |  |  |  |  |  |
Equity method investment, ownership (percent) | 80.00% |  |  |  |  |  | 80.00%
Payments to acquire interest in equity method investment | $ 68,400 |  |  |  |  |  |
Equity method investment, property | $ 187,500 |  |  |  |  |  |
Operating leases, term of contract | 4 years |  |  |  |  |  |
Equity in other comprehensive income (loss) of unconsolidated joint venture |  |  |  | $ (178) |  |  |

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