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Income Taxes (Details 7) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Valuation Allowance [Line Items] |  |  |
Balance at beginning of year | $ 40,966 | $ 38,347 | $ 44,995
Additions -Charges to earnings | 6,640 | 5,445 | 4,698
Deductions-Charges to earnings | 0 | (1,407) | (1,552)
Expiration And Forfeitures | (2,141) | (187) | (10,183)
Others (Note) | (1,145) | (1,232) | 389
Balance at end of year | $ 44,320 | $ 40,966 | $ 38,347

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