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Held for Sale/Disposed Assets - Summary of Operations of Properties Held for Sale (Details) - Held for sale - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Revenues $ 161 $ 159 $ 475 $ 473
Property operating expenses (35) (25) (88) (75)
Depreciation and amortization (32) (46) (127) (138)
Income from operations $ 94 $ 88 $ 260 $ 260