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Segment Reporting (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting [Abstract] |  |  |  |
Rental income from real estate assets sold or held for sale | $ 6,778 | $ 15,138 | $ 15,241 | $ 33,198
Operating expenses from real estate assets sold or held for sale | (2,336) | (5,411) | (5,341) | (11,705)
Net operating income from real estate assets sold or held for sale | $ 4,442 | $ 9,727 | $ 9,900 | $ 21,493

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