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Investments in and Advances to Unconsolidated Affiliates - Core Portfolio - Additional Information (Details) $ in Thousands |  |  |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 24, 2019 USD ($) ft² | Mar. 28, 2018 USD ($) | Nov. 16, 2017 USD ($) | May 01, 2017 USD ($) | Apr. 29, 2016 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Mar. 31, 2019 USD ($) ft²
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Purchase Price |  |  |  |  |  | $ 140,512 | $ 186,463 |
Notes receivable, net |  |  |  |  |  | 94,662 | 109,613 |
Note receivable accrued interest |  |  |  |  |  | 4,700 | 4,700 |
Brandywine Portfolio |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Preferred return |  |  |  |  |  |  |  | $ 5,600
Core Portfolio |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Purchase Price |  |  |  |  |  | 49,569 | 1,337 |
Notes receivable, net |  |  |  |  |  | $ 56,475 | 56,475 |
Note receivable accrued interest |  |  |  |  |  |  | $ 200 |
Equity method investment, ownership percentage by third party |  | 14.11% | 38.89% |  |  | 24.78% |  |
Equity method investment, ownership percentage |  |  | 22.22% |  |  | 75.22% | 61.11% |
Equity method investments |  | $ 22,300 | $ 61,600 |  |  | $ 230,456 | $ 231,432 |
Gain on equity method investment |  | 12,700 | 34,500 |  |  |  |  |
Core Portfolio | Renaissance Portfolio |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Percentage of voting interests acquired | 20.00% |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  | 20.00% |  |
Equity method investments |  |  |  |  |  | $ 32,675 | $ 32,458 |
Core Portfolio | Brandywine Portfolio |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Square footage of real estate property (in square feet) | ft² |  |  |  |  |  |  |  | 1,000,000
Repayments of debt |  |  |  |  | $ 140,000 |  |  |
Note receivable exchanged |  | 22,000 |  | $ 16,000 |  |  |  |
Notes receivable, net |  |  |  | 153,400 |  | $ 38,700 |  |
Note receivable accrued interest |  | $ 300 |  | $ 300 |  |  |  |
Core Portfolio | Brandywine Portfolio | Exchange Transaction One |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Note receivable exchanged |  |  | 16,000 |  |  |  |  |
Note receivable accrued interest |  |  | 600 |  |  |  |  |
Core Portfolio | Brandywine Portfolio | Exchange Transaction Two |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Note receivable exchanged |  |  | 60,700 |  |  |  |  |
Note receivable accrued interest |  |  | $ 900 |  |  |  |  |
Core Portfolio | Market Square |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity method investment, ownership percentage by third party |  |  | 38.89% | 38.89% |  |  |  |
Equity method investment, ownership percentage |  |  | 22.22% | 61.11% |  |  |  |
Equity method investments |  |  |  | $ 16,300 |  |  |  |
Gain on equity method investment |  |  |  | $ 9,800 |  |  |  |
Core Portfolio | Washington, D.C. | Renaissance Portfolio |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Square footage of real estate property (in square feet) | ft² | 7,300 |  |  |  |  |  |  |
Purchase Price | $ 10,700 |  |  |  |  |  |  |
Purchase price less the assumption of the outstanding mortgage | $ 4,700 |  |  |  |  |  |  |

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