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Income Taxes (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Current:      
Total current $ 6,897 $ 811 $ 1,747
Deferred:      
Total deferred 8,851 6,492 4,481
Actual income tax expense 15,748 7,301 6,228
Us Operations [Member]
      
Current:      
Total current 162 104 33
Deferred:      
Total deferred (998) 5 (30)
China Operations [Member]
      
Current:      
Total current 699 120 112
Deferred:      
Total deferred 89 162 (15)
Korea Operations [Member]
      
Current:      
Total current 3 5 12
Deferred:      
Total deferred 0 (2) 8
Others Operations [Member]
      
Current:      
Total current 1 0 1
Deferred:      
Total deferred 0 0 0
Taiwan operations - based on statutory tax rate of 17% [Member]
      
Current:      
Total current 755 (2,842) (54)
Deferred:      
Total deferred 9,789 6,468 4,824
Taiwan operations - 10% of surtax [Member]
      
Current:      
Total current 5,277 3,424 1,643
Deferred:      
Total deferred $ (29) $ (143) $ (306)