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Income Taxes (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Expense Benefit [Line Items]      
Earnings before income taxes $ 59,418 $ 32,867 $ 85,494
Taiwan operations [Member]      
Income Tax Expense Benefit [Line Items]      
Earnings before income taxes 63,347 28,349 69,532
Cayman operations [Member]      
Income Tax Expense Benefit [Line Items]      
Earnings before income taxes (4,569) 4,363 16,996
US operations [Member]      
Income Tax Expense Benefit [Line Items]      
Earnings before income taxes (842) (719) (2,248)
China operations [Member]      
Income Tax Expense Benefit [Line Items]      
Earnings before income taxes 1,336 825 1,105
Korea operations [Member]      
Income Tax Expense Benefit [Line Items]      
Earnings before income taxes 124 33 91
Japan operations [Member]      
Income Tax Expense Benefit [Line Items]      
Earnings before income taxes $ 22 $ 16 $ 18