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Consolidated Statement of Operations (Parenthetical) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Statement [Abstract] |  |  |
Income from discontinued operations, tax | $ 47,382,000 | $ 24,495,000 | $ 30,561,000
Tax from gain on sales of discontinued operations | $ 3,466 | $ 0 | $ 0

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