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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 | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 02, 2016 | Jan. 25, 2013
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity in income (loss) of Real Estate Ventures |  |  | $ (15,231) |  | $ (8,306) |  | $ (11,503) |  |  |
DRA Austin Venture [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Revenue |  |  | 53,476 |  | 85,500 |  | 85,749 |  |  |
Operating expenses |  |  | (22,994) |  | (35,997) |  | (37,643) |  |  |
Interest expense, net |  |  | (9,083) |  | (13,985) |  | (15,052) |  |  |
Depreciation and amortization |  |  | (19,226) |  | (34,026) |  | (38,365) |  |  |
Provision for impairment |  |  | 0 |  |  |  | 0 | [1] |  |
Loss on extinguishment of debt |  |  | (356) |  | (2,613) |  |  |  |  |
Net income (loss) |  |  | $ 1,817 |  | $ (1,121) |  | $ (5,311) | [2] |  |
Ownership interest % |  |  | 50.00% |  | 50.00% |  | 50.00% |  |  |
Company's share of net income (loss) |  |  | $ 909 |  | $ (560) |  | $ (2,656) |  |  |
Other-than-temporary impairment | [3] |  | 0 |  | 0 |  |  |  |  |
Basis adjustments and other |  |  | 778 |  | (429) |  | 776 |  |  |
Equity in income (loss) of Real Estate Ventures |  |  | 1,687 |  | (989) |  | (1,880) |  |  |
Brandywine - AI Venture LLC [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Revenue |  |  | 23,515 |  | 29,500 |  | 31,047 |  |  |
Operating expenses |  |  | (10,483) |  | (12,298) |  | (13,654) |  |  |
Interest expense, net |  |  | (3,478) |  | (4,707) |  | (5,825) |  |  |
Depreciation and amortization |  |  | (8,991) |  | (11,428) |  | (12,811) |  |  |
Provision for impairment |  |  | (20,832) |  |  |  | (10,476) | [1] |  |
Loss on extinguishment of debt |  |  | (695) |  | (811) |  |  |  |  |
Net income (loss) |  |  | $ (20,964) |  | $ 256 |  | $ (11,719) | [2] |  |
Ownership interest % |  |  | 50.00% | [4],[5] | 50.00% |  | 50.00% |  |  |
Company's share of net income (loss) |  |  | $ (10,482) |  | $ 128 |  | $ (5,860) |  |  |
Other-than-temporary impairment |  | $ (4,800) | (4,076) | [3] | (4,844) | [3] |  |  |  |
Basis adjustments and other |  |  | (1) |  | 251 |  | (35) |  |  |
Equity in income (loss) of Real Estate Ventures |  |  | (14,559) | [5] | (4,465) | [5] | (5,895) |  |  |
evo at Cira Centre South Venture [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Revenue |  |  | 163 |  | 12,285 |  | 12,393 |  |  |
Operating expenses |  |  | (256) |  | (3,075) |  | (3,183) |  |  |
Interest expense, net |  |  | (123) |  | (4,092) |  | (3,230) |  |  |
Depreciation and amortization |  |  | (409) |  | (4,512) |  | (4,512) |  |  |
Provision for impairment |  |  | 0 |  |  |  | 0 | [1] |  |
Loss on extinguishment of debt |  |  | 0 |  | 0 |  |  |  |  |
Net income (loss) |  |  | $ (625) |  | $ 606 |  | $ 1,468 | [2] |  |
Ownership interest % |  |  | 50.00% |  | 50.00% |  | 50.00% |  | 50.00% | 30.00%
Company's share of net income (loss) |  |  | $ (313) |  | $ 303 |  | $ 734 |  |  |
Other-than-temporary impairment | [3] |  | 0 |  | 0 |  |  |  |  |
Basis adjustments and other |  |  | (45) |  | 146 |  | 109 |  |  |
Equity in income (loss) of Real Estate Ventures |  |  | (358) |  | 449 |  | 843 |  |  |
Other Income [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Revenue |  |  | 88,172 |  | 88,986 |  | 85,263 |  |  |
Operating expenses |  |  | (48,302) |  | (47,970) |  | (48,712) |  |  |
Interest expense, net |  |  | (17,090) |  | (17,429) |  | (16,207) |  |  |
Depreciation and amortization |  |  | (25,200) |  | (28,474) |  | (30,050) |  |  |
Provision for impairment |  |  | 0 |  |  |  | 0 | [1] |  |
Loss on extinguishment of debt |  |  | (334) |  | 0 |  |  |  |  |
Net income (loss) |  |  | (2,754) |  | (4,887) |  | (9,706) | [2] |  |
Company's share of net income (loss) |  |  | (2,038) |  | (1,735) |  | (4,719) |  |  |
Other-than-temporary impairment | [3] |  | 0 |  | 0 |  |  |  |  |
Basis adjustments and other |  |  | 37 |  | (1,566) |  | 148 |  |  |
Equity in income (loss) of Real Estate Ventures |  |  | (2,001) |  | (3,301) |  | (4,571) |  |  |
Unconsolidated Real Estate Ventures [Member] |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Revenue |  |  | 165,326 |  | 216,271 |  | 214,452 |  |  |
Operating expenses |  |  | (82,035) |  | (99,340) |  | (103,192) |  |  |
Interest expense, net |  |  | (29,774) |  | (40,213) |  | (40,314) |  |  |
Depreciation and amortization |  |  | (53,826) |  | (78,440) |  | (85,738) |  |  |
Provision for impairment |  |  | (20,832) |  |  |  | (10,476) | [1] |  |
Loss on extinguishment of debt |  |  | (1,385) |  | (3,424) |  |  |  |  |
Net income (loss) |  |  | (22,526) |  | (5,146) |  | (25,268) | [2] |  |
Company's share of net income (loss) |  |  | (11,924) |  | (1,864) |  | (12,501) |  |  |
Other-than-temporary impairment | [3] |  | (4,076) |  | (4,844) |  |  |  |  |
Basis adjustments and other |  |  | 769 |  | (1,598) |  | 998 |  |  |
Equity in income (loss) of Real Estate Ventures |  |  | $ (15,231) |  | $ (8,306) |  | $ (11,503) |  |  |
[1] | See “Brandywine - AI Venture: Station Square Impairment” section 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.
[3] | See “Brandywine - AI Venture: Other Than Temporary Impairment” section below.
[4] | Ownership percentage represents the Company’s entitlement to residual distributions after payments of priority returns, where applicable.
[5] | See “Brandywine - AI Venture: Station Square and 7101 Wisconsin Avenue” and “Brandywine - AI Venture: Other Than Temporary Impairment” sections below for information discussing activity that occurred during 2018 and 2017 relating to this venture.

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