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Investment in Unconsolidated Real Estate Ventures - Summary of Results of Operations of Real Estate Ventures with Interests (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Equity in loss of Real Estate Ventures |  | $ (11,503) | $ (811) | $ (790)
Unconsolidated Real Estate Ventures [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Revenue |  | 214,452 | 164,928 | 147,236
Operating expenses |  | (110,265) | (70,136) | (61,268)
Provision for impairment | [1] | (10,476) | 0 | 0
Interest expense, net |  | (43,283) | (34,584) | (36,511)
Depreciation and amortization |  | (85,738) | (68,100) | (57,109)
Net loss | [2] | (35,310) | (7,892) | (7,652)
Equity in loss of Real Estate Ventures |  | $ (11,503) | $ (811) | $ (790)
[1] | During the year ended December 31, 2016, Brandywine - AI Venture LLC recorded a property level impairment charge of $10.4 million. See additional details in the “Station Square Impairment” disclosure below.
[2] | During the year ended December 31, 2016, there were $7.1 million of acquisition deal costs related to the formation of the MAP Venture.

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