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CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Income Statement [Abstract] |  |  |  |
Gains (losses) on disposition of properties | $ 0 | $ 3,285 | $ 0 | $ 14,771

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