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Segment Reporting (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting [Abstract] |  |  |  |
Rental income from real estate assets sold or held for sale | $ 4,006 | $ 16,280 | $ 24,747 | $ 54,803
Operating expenses from real estate assets sold or held for sale | (1,461) | (5,940) | (8,834) | (19,641)
Net operating income from real estate assets sold or held for sale | $ 2,545 | $ 10,340 | $ 15,913 | $ 35,162

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