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Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement of Stockholders' Equity [Abstract] |  |  |
Exercise of options, income tax expense | $ 0 | $ 2,051 | $ 2,050
Restricted share grants, settled (in shares) | 92 | 137 | 116

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