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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Equity in income (loss) of Real Estate Ventures | $ 1 | $ (5,723) | $ (1,182) | $ (5,387)
DRA Austin Venture [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Revenue | 14,232 | 22,493 | 42,492 | 70,185
Operating expenses | (6,428) | (10,107) | (18,245) | (29,119)
Interest expense, net | (2,549) | (3,784) | (7,070) | (11,217)
Depreciation and amortization | (4,896) | (9,334) | (15,622) | (27,627)
Loss on early extinguishment of debt | 0 |  | 0 |
Net income (loss) | $ 359 | $ (732) | $ 1,555 | $ 2,222
Ownership interest % | 50.00% | 50.00% | 50.00% | 50.00%
Company's share of net income (loss) | $ 180 | $ (366) | $ 778 | $ 1,111
Other-than-temporary impairment |  | 0 |  | 0
Basis adjustments and other | 243 | 351 | 378 | 155
Equity in income (loss) of Real Estate Ventures | 423 | (15) | 1,156 | 1,266
Brandywine - AI Venture LLC [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Revenue | 5,962 | 8,438 | 17,768 | 23,751
Operating expenses | (2,589) | (4,359) | (8,010) | (10,547)
Interest expense, net | (873) | (1,384) | (2,606) | (3,830)
Depreciation and amortization | (2,232) | (3,251) | (6,915) | (9,193)
Loss on early extinguishment of debt | 0 |  | 0 |
Net income (loss) | $ 268 | $ (556) | $ 237 | $ 181
Ownership interest % | 50.00% | 50.00% | 50.00% | 50.00%
Company's share of net income (loss) | $ 134 | $ (278) | $ 119 | $ 91
Other-than-temporary impairment |  | (4,844) |  | (4,844)
Basis adjustments and other | 31 | (8) | 33 | 291
Equity in income (loss) of Real Estate Ventures | 165 | (5,130) | 152 | (4,462)
HSRE-BDN I, LLC (evo at Cira Centre South) [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Revenue | 0 | 3,009 | 995 | 9,264
Operating expenses | 0 | (841) | (250) | (2,232)
Interest expense, net | 0 | (1,097) | (388) | (3,009)
Depreciation and amortization | 0 | (1,128) | (376) | (3,384)
Loss on early extinguishment of debt | 0 |  | (718) |
Net income (loss) | $ 0 | $ (57) | $ (737) | $ 639
Ownership interest % | 50.00% | 50.00% | 50.00% | 50.00%
Company's share of net income (loss) | $ 0 | $ (29) | $ (369) | $ 320
Other-than-temporary impairment |  | 0 |  | 0
Basis adjustments and other | 0 | 53 | 11 | 105
Equity in income (loss) of Real Estate Ventures | 0 | 24 | (358) | 425
Other Income [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Revenue | 21,823 | 22,571 | 64,684 | 66,409
Operating expenses | (12,123) | (12,111) | (35,492) | (35,858)
Interest expense, net | (4,122) | (5,406) | (13,558) | (15,716)
Depreciation and amortization | (6,135) | (6,970) | (18,526) | (21,612)
Loss on early extinguishment of debt | (334) |  | (334) |
Net income (loss) | (891) | (1,916) | (3,226) | (6,777)
Company's share of net income (loss) | (550) | (1,002) | (1,946) | (2,909)
Other-than-temporary impairment |  | 0 |  | 0
Basis adjustments and other | (37) | 400 | (186) | 293
Equity in income (loss) of Real Estate Ventures | (587) | (602) | (2,132) | (2,616)
Unconsolidated Real Estate Ventures [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Revenue | 42,017 | 56,511 | 125,939 | 169,609
Operating expenses | (21,140) | (27,418) | (61,997) | (77,756)
Interest expense, net | (7,544) | (11,671) | (23,622) | (33,772)
Depreciation and amortization | (13,263) | (20,683) | (41,439) | (61,816)
Loss on early extinguishment of debt | (334) |  | (1,052) |
Net income (loss) | (264) | (3,261) | (2,171) | (3,735)
Company's share of net income (loss) | (236) | (1,675) | (1,418) | (1,387)
Other-than-temporary impairment |  | (4,844) |  | (4,844)
Basis adjustments and other | 237 | 796 | 236 | 844
Equity in income (loss) of Real Estate Ventures | $ 1 | $ (5,723) | $ (1,182) | $ (5,387)

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