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Real Estate Investments - Summary of Land Parcels Sold (Parenthetical) (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | ---
Jan. 08, 2015 USD ($) | Jan. 31, 2019 USD ($) Installment | Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Sale of undeveloped land |  |  | $ 5,273 | $ 14,921
Land [Member] |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Sale of undeveloped land |  |  | 5,273 |
Libertyview [Member] | Land [Member] |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Contingent consideration to received |  | $ 1,000 |  |
Number of installments | Installment |  | 12 |  |
Sale of undeveloped land | $ 250 |  | $ 300 |

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