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Income Taxes (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Expense Benefit [Line Items]      
Earnings before income taxes $ 32,867 $ 85,494 $ 75,400
Taiwan Operations [Member]      
Income Tax Expense Benefit [Line Items]      
Earnings before income taxes 28,349 69,532 77,130
Cayman Operations [Member]      
Income Tax Expense Benefit [Line Items]      
Earnings before income taxes 4,363 16,996 (57)
US operations [Member]      
Income Tax Expense Benefit [Line Items]      
Earnings before income taxes (719) (2,248) (2,251)
China Operations [Member]      
Income Tax Expense Benefit [Line Items]      
Earnings before income taxes 825 1,105 506
Korea Operations [Member]      
Income Tax Expense Benefit [Line Items]      
Earnings before income taxes 33 91 55
Japan Operations [Member]      
Income Tax Expense Benefit [Line Items]      
Earnings before income taxes $ 16 $ 18 $ 17