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Acquisitions, Dispositions, Discontinued Operations and Assets Held for Sale Acquisitions, Dispositions, Discontinued Operations and Assets Held for Sale (Income from Discontinued Operations) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Property revenues |  | $ 14,827
Property expenses |  | (5,148)
Property revenues less property expenses |  | 9,679
Property management expense |  | (176)
Depreciation and amortization |  | (4,327)
Income tax expense |  | (100)
Income from discontinued operations | $ 0 | $ 5,076

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