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Income Taxes (Details 7) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Tax effect 26,388
Taiwan operations [Member]
 
Deductible amount 138,080
Tax effect 23,481
Taiwan operations [Member] | Minimum [Member]
 
Expiration year (in years) 2014
Taiwan operations [Member] | Maximum [Member]
 
Expiration year (in years) 2022
China operations [Member]
 
Deductible amount 1,807
Tax effect 298
China operations [Member] | Minimum [Member]
 
Expiration year (in years) 2016
China operations [Member] | Maximum [Member]
 
Expiration year (in years) 2020
US operations [Member]
 
Deductible amount 6,236
Tax effect 2,609
US operations [Member] | Minimum [Member]
 
Expiration year (in years) 2024
US operations [Member] | Maximum [Member]
 
Expiration year (in years) 2032