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Income Taxes (Details 3) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax [Line Items]      
Deferred income tax expense (benefit), exclusive of the effects of other components listed below $ (405) $ (546) $ 732
Tax expenses (benefits) of unrealized foreign exchange gain (1,569) 512 2,142
Tax expenses (benefits) of allowance for doubtful accounts (4) 2,304 (57)
Tax expenses of used investment tax credits 0 3,337 1,431
Tax benefits of advanced share-based compensation deductions 0 (1,459) (432)
Deferred Income Tax Expense (Benefit) $ (1,978) $ 4,148 $ 3,816