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Income Taxes (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current:      
Total current income tax expense $ 12,649 $ 7,257 $ 17,775
Deferred:      
Total deferred income tax expense (benefit) (1,978) 4,148 3,816
Income tax expense 10,671 11,405 21,591
Taiwan operations - based on statutory tax rate of 17% [Member]      
Current:      
Total current income tax expense 6,451 1,467 8,928
Deferred:      
Total deferred income tax expense (benefit) (2,033) 4,527 3,633
Taiwan operations - 10% of surtax [Member]      
Current:      
Total current income tax expense 5,733 5,405 8,398
Deferred:      
Total deferred income tax expense (benefit) (1) (287) 186
US operations [Member]      
Current:      
Total current income tax expense 107 24 83
Deferred:      
Total deferred income tax expense (benefit) 10 (18) 3
China operations [Member]      
Current:      
Total current income tax expense 308 338 347
Deferred:      
Total deferred income tax expense (benefit) 61 (68) (2)
Korea operations [Member]      
Current:      
Total current income tax expense 43 17 12
Deferred:      
Total deferred income tax expense (benefit) (15) (6) (4)
Japan operations [Member]      
Current:      
Total current income tax expense $ 7 $ 6 $ 7