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CONSOLIDATED STATEMENTS OF INCOME (Unaudited) CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (Parentheticals) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Income Statement [Abstract] |  |
Gain (loss) on disposition of property of equity method investment | $ 11,486 | $ 0

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