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Real Estate Investments - Summary of Land Parcels Sold (Details) $ in Thousands |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Mar. 15, 2019 USD ($) a | Jan. 08, 2015 USD ($) a Parcel | Jun. 30, 2019 USD ($) a | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) a Parcel | Jun. 30, 2018 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from the sale of properties |  |  |  |  | $ 5,523 | $ 16,771
Gain on Sale |  |  | $ 250 | $ 2,837 | $ 1,251 | $ 2,859
Land [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Parcels | Parcel |  |  |  |  | 1 |
Acreage of Land | a |  |  | 2.7 |  | 2.7 |
Sales Price |  |  | $ 5,325 |  | $ 5,325 |
Proceeds from the sale of properties |  |  |  |  | 5,023 |
Gain on Sale |  |  |  |  | $ 1,251 |
Land [Member] | 9 Presidential Boulevard [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Parcels | Parcel |  |  |  |  | 1 |
Acreage of Land | a | 2.7 |  |  |  |  |
Sales Price | $ 5,325 |  |  |  |  |
Proceeds from the sale of properties | 5,023 |  |  |  |  |
Gain on Sale | $ 751 |  |  |  |  |
Land [Member] | Libertyview [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Parcels | Parcel |  | 0 |  |  |  |
Acreage of Land | a |  | 0 |  |  |  |
Sales Price |  | $ 0 |  |  |  |
Proceeds from the sale of properties |  | 0 |  |  | $ 500 |
Gain on Sale |  | $ 500 |  |  |  |

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