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Investments in and Advances to Unconsolidated Affiliates - Core Portfolio (Details) $ in Thousands |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
May 01, 2017 USD ($) | Jan. 04, 2017 USD ($) ft² | Apr. 29, 2016 USD ($) | Sep. 30, 2017 USD ($) ft² property | Dec. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Purchase Price |  |  |  | $ 149,732 | $ 756,842
Notes receivable, net |  |  |  | 250,194 | 276,163
Brandywine Market Square |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Notes receivable, net | $ 153,400 |  |  |  |
Core Portfolio |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Purchase Price |  |  |  |  | 519,592
Notes receivable, net |  |  |  | 198,395 | 216,400
Equity method investments |  |  |  | $ 175,535 | 165,031
Core Portfolio | Crossroads |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage |  |  |  | 49.00% |
Square footage of real estate property (in square feet) | ft² |  |  |  | 311,000 |
Core Portfolio | Georgetown Portfolio |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage |  |  |  | 50.00% |
Square footage of real estate property (in square feet) | ft² |  |  |  | 28,000 |
Equity method investments |  |  |  | $ 3,751 | 4,287
Core Portfolio | Gotham Plaza |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage |  |  |  | 49.00% |
Square footage of real estate property (in square feet) | ft² |  |  |  | 123,000 |
Percentage of voting interests acquired |  |  |  | 49.00% |
Equity method investments |  |  |  | $ 29,196 | 29,421
Core Portfolio | Renaissance Portfolio |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage |  |  |  | 20.00% |
Square footage of real estate property (in square feet) | ft² |  |  |  | 213,000 |
Percentage of voting interests acquired |  | 20.00% |  |  |
Number of businesses acquired | property |  |  |  | 18 |
Equity method investments |  |  |  | $ 35,139 | 36,437
Core Portfolio | Brandywine Portfolio |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage |  |  |  | 22.22% |
Square footage of real estate property (in square feet) | ft² |  |  |  | 1,000,000 |
Repayments of debt |  |  | $ 140,000 |  |
Equity method investments |  |  |  | $ 15,948 | 15,286
Core Portfolio | Brandywine Market Square |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage | 61.11% |  |  | 61.11% |
Note receivable exchanged | $ 16,000 |  |  |  |
Note receivable accrued interest | $ 300 |  |  | $ 300 |
Equity method investment, ownership percentage by third party | 38.89% |  |  |  |
Equity method investments | $ 16,600 |  |  | $ 20,642 | $ 5,469
Gain on equity method investment | $ 9,800 |  |  |  |
Core Portfolio | Chicago, IL |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage |  |  |  | 88.43% |
Square footage of real estate property (in square feet) | ft² |  |  |  | 87,000 |
Core Portfolio | Alexandria, Virginia | Renaissance Portfolio |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Square footage of real estate property (in square feet) | ft² |  | 6,200 |  |  |
Purchase Price |  | $ 3,000 |  |  |
Number of businesses acquired | property |  |  |  | 2 |
Core Portfolio | Washington D.C. | Renaissance Portfolio |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of businesses acquired | property |  |  |  | 16 |

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