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Income Taxes (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Expense Benefit [Line Items]      
Earnings before income taxes $ 75,400 $ 65,886 $ 16,808
Taiwan Operations [Member]
     
Income Tax Expense Benefit [Line Items]      
Earnings before income taxes 77,130 73,461 22,370
Cayman Operations [Member]
     
Income Tax Expense Benefit [Line Items]      
Earnings before income taxes (57) (7,395) (7,038)
Us Operations [Member]
     
Income Tax Expense Benefit [Line Items]      
Earnings before income taxes (2,251) (1,597) 151
China Operations [Member]
     
Income Tax Expense Benefit [Line Items]      
Earnings before income taxes 506 1,388 1,293
Korea Operations [Member]
     
Income Tax Expense Benefit [Line Items]      
Earnings before income taxes 55 29 32
Japan Operations [Member]
     
Income Tax Expense Benefit [Line Items]      
Earnings before income taxes $ 17 $ 0 $ 0