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Investments in and Advances to Unconsolidated Affiliates - Core Portfolio (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2017 USD ($) ft² | Apr. 29, 2016 USD ($) | Mar. 31, 2017 USD ($) ft² property | Dec. 31, 2016 USD ($) | Jan. 31, 2016 ft²
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Purchase Price | $ |  |  | $ 35,350 | $ 558,755 |
Core Portfolio [Member] | Crossroads [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage |  |  | 49.00% |  |
Square footage of real estate property (in square feet) |  |  | 311,000 |  |
Core Portfolio [Member] | Georgetown Portfolio [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage |  |  | 50.00% |  |
Square footage of real estate property (in square feet) |  |  | 28,000 |  |
Core Portfolio [Member] | Gotham Plaza [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage |  |  | 49.00% |  |
Square footage of real estate property (in square feet) |  |  |  |  | 123,000
Percentage of voting interests acquired |  |  |  |  | 49.00%
Core Portfolio [Member] | Renaissance Portfolio [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage |  |  | 20.00% |  |
Square footage of real estate property (in square feet) |  |  | 213,000 |  |
Percentage of voting interests acquired | 20.00% |  |  |  |
Number of businesses acquired | property |  |  | 18 |  |
Core Portfolio [Member] | Brandywine Portfolio [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage |  |  | 22.22% |  |
Square footage of real estate property (in square feet) |  |  | 1,000,000 |  |
Repayments of debt | $ |  | $ 140,000 |  |  |
Core Portfolio [Member] | Chicago, Illinois [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment, ownership percentage |  |  | 88.43% |  |
Square footage of real estate property (in square feet) |  |  | 87,000 |  |
Core Portfolio [Member] | Alexandria, Virginia [Member] | Renaissance Portfolio [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Square footage of real estate property (in square feet) | 6,200 |  |  |  |
Purchase Price | $ | $ 3,000 |  |  |  |
Number of businesses acquired | property |  |  | 2 |  |
Core Portfolio [Member] | Washington D.C. [Member] | Renaissance Portfolio [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of businesses acquired | property |  |  | 16 |  |

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