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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
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 28, 2018 USD ($) | Nov. 16, 2017 USD ($) | May 01, 2017 USD ($) | Jan. 04, 2017 USD ($) ft² | Apr. 29, 2016 USD ($) | Mar. 31, 2018 USD ($) ft² property | Dec. 31, 2017 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Purchase Price |  |  |  |  |  | $ 46,596 | $ 254,532
Notes receivable, net |  |  |  |  |  | 108,959 | 153,829
Brandywine Portfolio |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Preferred return |  |  |  |  |  | 5,600 |
Core Portfolio |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Purchase Price |  |  |  |  |  | 1,337 | 42,800
Notes receivable, net |  |  |  |  |  | 56,475 | 101,695
Note receivable accrued interest |  |  |  |  |  | 200 |
Equity method investments |  |  |  |  |  | $ 237,425 | 216,583
Core Portfolio | Crossroads |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  | 49.00% |
Core Portfolio | Georgetown Portfolio |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  | 50.00% |
Equity method investments |  |  |  |  |  | $ 3,540 | 3,479
Core Portfolio | Gotham Plaza |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  | 49.00% |
Equity method investments |  |  |  |  |  | $ 29,408 | 29,416
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 |  |  |  |  |  | $ 34,294 | $ 35,041
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 | Town Center |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investment, ownership percentage |  | 22.22% |  |  |  | 75.22% | 61.11%
Note receivable exchanged |  |  |  |  |  | $ 22,000 |
Note receivable accrued interest |  |  |  |  |  | $ 300 |
Equity method investment, ownership percentage by third party | 14.11% | 38.89% |  |  |  | 24.78% |
Equity method investments | $ 22,300 | $ 61,600 |  |  |  |  |
Gain on equity method investment | $ 12,700 | $ 34,500 |  |  |  |  |
Core Portfolio | Market Square |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investment, ownership percentage |  | 22.22% | 61.11% |  |  |  |
Equity method investment, ownership percentage by third party |  | 38.89% | 38.89% |  |  |  |
Equity method investments |  |  | $ 16,300 |  |  |  |
Gain on equity method investment |  |  | $ 9,800 |  |  |  |
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 |
Exchange Transaction One | Core Portfolio | Brandywine Portfolio |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Note receivable exchanged |  | $ 16,000 |  |  |  |  |
Note receivable accrued interest |  | 600 |  |  |  |  |
Exchange Transaction Two | Core Portfolio | Brandywine Portfolio |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Note receivable exchanged |  | 60,700 |  |  |  |  |
Note receivable accrued interest |  | $ 900 |  |  |  |  |

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