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Real Estate Investments - Summary of Land Parcels Sold (Details) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 15, 2019 USD ($) a parcel | Jan. 08, 2015 USD ($) a parcel | Jan. 31, 2019 USD ($) installment | Sep. 30, 2019 USD ($) a | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) a parcel | Sep. 30, 2018 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from the sale of properties |  |  |  |  |  | $ 41,546 | $ 16,771
Gain (loss) on sale |  |  |  | $ 250 | $ 0 | $ 1,501 | $ 2,859
Land |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number of parcels of land | parcel |  |  |  |  |  | 1 |
Area of land (in acres) | a |  |  |  | 2.7 |  | 2.7 |
Sales price |  |  |  | $ 5,325 |  | $ 5,325 |
Proceeds from the sale of properties |  |  |  |  |  | 5,023 |
Gain (loss) on sale |  |  |  |  |  | 1,501 |
Land | 9 Presidential Boulevard |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number of parcels of land | parcel | 1 |  |  |  |  |  |
Area of land (in acres) | a | 2.7 |  |  |  |  |  |
Sales price | $ 5,325 |  |  |  |  |  |
Proceeds from the sale of properties | 5,023 |  |  |  |  |  |
Gain (loss) on sale | $ 751 |  |  |  |  |  |
Land | Libertyview |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number of parcels of land | parcel |  | 0 |  |  |  |  |
Area of land (in acres) | a |  | 0 |  |  |  |  |
Sales price |  | $ 0 |  |  |  |  |
Proceeds from the sale of properties |  | 0 |  |  |  | $ 800 |
Gain (loss) on sale |  | $ 750 |  |  |  |  |
Contingent consideration to received |  |  | $ 1,000 |  |  |  |
Number of installments | installment |  |  | 12 |  |  |  |

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