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Investment in Unconsolidated Real Estate Ventures - Summary of Financial Position of Real Estate Ventures (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Schedule Of Equity Method Investments [Line Items] |  |  |  |
Net property |  | $ 835,983 |  | $ 1,083,965
Other assets |  | 159,499 |  | 161,932
Other liabilities |  | 85,681 |  | 97,707
Debt, net |  | 365,707 |  | 766,420
Equity | [1] | 544,094 |  | 381,770
DRA Austin Venture [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Net property |  | 0 | [2] | 263,557
Other assets |  | 0 | [2] | 42,272
Other liabilities |  | 0 | [2] | 24,131
Debt, net |  | 0 | [2] | 248,700
Equity | [1] | 0 | [2] | 32,998
Brandywine - AI Venture LLC [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Net property |  | 47,043 |  | 158,960
Other assets |  | 11,206 |  | 24,181
Other liabilities |  | 2,002 |  | 4,493
Debt, net |  | 26,020 |  | 92,917
Equity | [1] | 30,227 |  | 85,731
evo at Cira Centre South Venture [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Net property |  | 0 | [3] | 143,990
Other assets |  | 0 | [3] | 8,563
Other liabilities |  | 0 | [3] | 1,648
Debt, net |  | 0 | [3] | 110,136
Equity | [1] | 0 | [3] | 40,769
Other Income [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Net property |  | 788,940 |  | 517,458
Other assets |  | 148,293 |  | 86,916
Other liabilities |  | 83,679 |  | 67,435
Debt, net |  | 339,687 |  | 314,667
Equity | [1] | $ 513,867 |  | $ 222,272
[1] | This amount includes the effect of the basis difference between the Company’s historical cost basis and the basis recorded at the Real Estate Venture level, which is typically amortized over the life of the related assets and liabilities. Basis differentials occur from the impairment of investments, purchases of third party interests in existing Real Estate Ventures and upon the transfer of assets that were previously owned by the Company into a Real Estate Venture. In addition, certain acquisition, transaction and other costs may not be reflected in the net assets at the Real Estate Venture level.
[2] | On December 11, 2018, the Company acquired DRA’s 50% ownership interest in the DRA Austin Venture for an aggregate purchase price of $535.1 million. See “Austin Venture” section below.
[3] | On January 10, 2018, HSRE-BDN I, LLC (evo at Cira Centre South) sold the 345-unit student housing tower, its sole operating asset. See “evo at Cira Disposition” section below.

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