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Income Taxes (Details 7) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Valuation Allowance [Line Items] |  |  |
Balance at beginning of year | $ 44,320 | $ 40,966 | $ 38,347
Additions -Charges to earnings | 7,077 | 6,640 | 5,445
Deductions-Charges to earnings | (275) | 0 | (1,407)
Expiration And Forfeitures | (998) | (2,141) | (187)
Others (Note) | 1,118 | (1,145) | (1,232)
Balance at end of year | $ 51,242 | $ 44,320 | $ 40,966

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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=65882285&loc=d3e32537-109319 + Details
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