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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 | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Schedule Of Equity Method Investments [Line Items] |  |
Equity in income (loss) of Real Estate Ventures | $ (825) | $ (748)
DRA Austin Venture [Member] |  |
Schedule Of Equity Method Investments [Line Items] |  |
Revenue | 14,356 | 21,552
Operating expenses | (6,066) | (9,313)
Interest expense, net | (2,294) | (3,689)
Depreciation and amortization | (5,698) | (9,229)
Net income (loss) | $ 298 | $ (679)
Ownership interest % | 50.00% | 50.00%
Company's share of net income (loss) | $ 149 | $ (340)
Basis adjustments and other | (69) | (25)
Equity in income (loss) of Real Estate Ventures | 80 | (365)
Brandywine - AI Venture LLC [Member] |  |
Schedule Of Equity Method Investments [Line Items] |  |
Revenue | 5,836 | 7,325
Operating expenses | (2,544) | (2,940)
Interest expense, net | (864) | (1,145)
Depreciation and amortization | (2,137) | (2,809)
Net income (loss) | $ 291 | $ 431
Ownership interest % | 50.00% | 50.00%
Company's share of net income (loss) | $ 146 | $ 216
Basis adjustments and other | 15 | 310
Equity in income (loss) of Real Estate Ventures | 161 | 526
HSRE-BDN I, LLC (evo at Cira Centre South) [Member] |  |
Schedule Of Equity Method Investments [Line Items] |  |
Revenue | 995 | 3,154
Operating expenses | (250) | (679)
Interest expense, net | (388) | (898)
Depreciation and amortization | (376) | (1,128)
Loss on early extinguishment of debt | (718) |
Net income (loss) | $ (737) | $ 449
Ownership interest % | 50.00% | 50.00%
Company's share of net income (loss) | $ (369) | $ 225
Basis adjustments and other | 11 | 7
Equity in income (loss) of Real Estate Ventures | (358) | 232
Other [Member] |  |
Schedule Of Equity Method Investments [Line Items] |  |
Revenue | 21,634 | 22,248
Operating expenses | (11,908) | (12,234)
Interest expense, net | (4,580) | (5,098)
Depreciation and amortization | (6,173) | (7,595)
Net income (loss) | (1,027) | (2,679)
Company's share of net income (loss) | (632) | (1,262)
Basis adjustments and other | (76) | 121
Equity in income (loss) of Real Estate Ventures | (708) | (1,141)
Unconsolidated Real Estate Ventures [Member] |  |
Schedule Of Equity Method Investments [Line Items] |  |
Revenue | 42,821 | 54,279
Operating expenses | (20,768) | (25,166)
Interest expense, net | (8,126) | (10,830)
Depreciation and amortization | (14,384) | (20,761)
Loss on early extinguishment of debt | (718) |
Net income (loss) | (1,175) | (2,478)
Company's share of net income (loss) | (706) | (1,161)
Basis adjustments and other | (119) | 413
Equity in income (loss) of Real Estate Ventures | $ (825) | $ (748)

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