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Income Taxes (Details 3) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Summarizes the changes in the valuation allowance |  |  |
Balance at beginning of year | $ 26,968 | $ 27,022 | $ 3,939
Additions | 104 | 31 | 25,043
Deductions | (11,650) | (85) | (1,960)
Balance at end of year | $ 15,422 | $ 26,968 | $ 27,022

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- Definition Valuation allowance deductions. + References No definition available. + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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