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Investments in and Advances to Unconsolidated Affiliates - Core Portfolio (Details) ft² in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 USD ($) ft² property | Apr. 29, 2016 USD ($) | Jan. 31, 2016 USD ($) ft² shares | Dec. 31, 2016 USD ($) ft² shares | Dec. 31, 2015 USD ($) shares | Mar. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  | 65.00%
Purchase Price |  |  |  | $ 756,842 | $ 451,220 |
Common Shares |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Issuance of Common Shares, net of issuance costs (in Shares) | shares |  |  |  | 4,830,000 | 1,600,000 |
Gotham Plaza [Member] | Common Shares |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Issuance of Common Shares, net of issuance costs (in Shares) | shares |  |  | 442,478 |  |  |
Gotham Plaza [Member] | Preferred OP Units [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Issuance of Common Shares, net of issuance costs (in Shares) | shares |  |  | 141,593 |  |  |
Core Portfolio [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Purchase Price |  |  |  | $ 519,592 | $ 204,243 |
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) | ft² |  |  |  | 311 |  |
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) | ft² |  |  |  | 28 |  |
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) | ft² |  |  | 123 |  |  |
Percentage of voting interests acquired |  |  | 49.00% |  |  |
Purchase Price |  |  | $ 39,800 |  |  |
Percentage of long-term debt assumed |  |  | 49.00% |  |  |
Long-term debt assumed |  |  | $ 21,400 |  |  |
Core Portfolio [Member] | Gotham Plaza [Member] | Common Shares |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Issuance of Common Shares, net of issuance costs (in Shares) | shares |  |  | 442,478 |  |  |
Core Portfolio [Member] | Gotham Plaza [Member] | Preferred OP Units [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Issuance of Common Shares, net of issuance costs (in Shares) | shares |  |  | 141,593 |  |  |
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) | ft² | 211 |  |  |  |  |
Percentage of voting interests acquired | 20.00% |  |  |  |  |
Purchase Price | $ 67,600 |  |  |  |  |
Long-term debt assumed | $ 20,000 |  |  |  |  |
Number of businesses acquired | property | 17 |  |  |  |  |
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) | ft² |  |  |  | 1,000 |  |
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) | ft² |  |  |  | 87 |  |
Core Portfolio [Member] | Washington D.C. [Member] | Renaissance Portfolio [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Number of businesses acquired | property | 16 |  |  |  |  |
Core Portfolio [Member] | Alexandria, Virginia [Member] | Renaissance Portfolio [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Number of businesses acquired | property | 1 |  |  |  |  |

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