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Investments in Real Estate - Additional Information (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) a | Dec. 31, 2018 USD ($) a
Real Estate [Line Items] |  |
Below-market leases, net of accretion | $ 23,308 | $ 17,923
Future accretion, year 1 |  | 2,144
Future accretion, year 2 |  | 2,118
Future accretion, year 3 |  | 1,778
Future accretion, year 4 |  | 1,499
Future accretion, year 5 |  | $ 1,499
Change in amount of contingent consideration | $ 3,922 |
Etna GL 66 LLC [Member] |  |
Real Estate [Line Items] |  |
Area of land (in acres) | a | 151 | 57

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