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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Revenues $ 0 $ 20 $ 32 $ 248
Property operating expenses (34) (13) (32) (50)
Depreciation and amortization 0 (6) 0 (39)
Income from operations $ (34) $ 1 $ 0 $ 159