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Investments in Non-Consolidated Entities - Schedule of Investment in Non-Consolidated Entities (Details) $ in Thousands |  | 1 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 31, 2019 USD ($) | Feb. 28, 2019 USD ($) | Dec. 31, 2018 USD ($) a | Jun. 30, 2020 USD ($) numberOfPartnerships office_asset | Dec. 31, 2019 USD ($) a | Dec. 31, 2017 a
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Investment balance |  |  |  | $ 56,040 | $ 57,168 |
Number of joint venture interests | numberOfPartnerships |  |  |  | 1 |  |
Non-consolidated Real Estate Entity |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Ownership percentage |  | 15.00% |  |  |  |
NNN Office JV LP |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Ownership percentage |  |  |  | 20.00% |  |
Investment balance |  |  |  | $ 35,666 | 39,288 |
Etna Park 70 LLC |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Ownership percentage |  |  |  | 90.00% |  |
Investment balance |  |  |  | $ 10,229 | 8,352 |
Area of land (in acres) | a |  |  | 57 |  |  | 151
Payments to acquire interest in joint venture |  |  | $ 3,008 |  |  |
Etna Park East LLC |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Ownership percentage |  |  |  | 90.00% |  |
Investment balance |  |  |  | $ 5,148 | $ 4,310 |
Area of land (in acres) | a |  |  |  |  | 129.6 |
Other Joint Ventures |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Ownership percentage |  |  |  | 25.00% |  |
Investment balance |  |  |  | $ 4,997 | $ 5,218 |
Mortgages | NNN Office JV LP |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Non-recourse mortgage loan |  |  |  | $ 12,960 |  |
NNN Office Joint Venture Properties |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Aggregate gain on sale of properties |  | $ 803 |  |  |  |
NNN Office Joint Venture Properties | NNN Office JV LP |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Number of properties sold | office_asset |  |  |  | 1 |  |
Aggregate gain on sale of properties | $ 270 |  |  | $ 550 |  |
Aggregate gross disposition price |  |  |  | $ 3,419 |  |
Office Building |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Proceeds from sale of joint venture |  | $ 2,317 |  |  |  |

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