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Income Taxes Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |
Re-measurement of net deferred tax asset | $ 15,635 | $ 0 | $ 0

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- References No definition available. + Details
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