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CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Income Statement [Abstract] |  |  |  |
Gains on disposition of property of equity method investment | $ 3,285 | $ 0 | $ 14,771 | $ 0

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