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Income Taxes (Details 6)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Unrecognized deferred tax assets $ 45,180
Taiwan operations [Member] | Expiration year 2019~2023 [Member]  
Deductible amount 95,334
Unrecognized deferred tax assets $ 19,067
Expiration year 2019~2023
Others [Member] | Expiration year 2024~2028 [Member]  
Deductible amount $ 106,216
Unrecognized deferred tax assets $ 21,243
Expiration year 2024~2028
Hong Kong operations [Member]  
Deductible amount $ 1,810
Unrecognized deferred tax assets $ 149
Expiration year Indefinitely
US operations [Member]  
Deductible amount $ 10,666
Unrecognized deferred tax assets $ 2,832
Expiration year 2025~2038
Israel operations [Member]  
Deductible amount $ 8,214
Unrecognized deferred tax assets $ 1,889
Expiration year Indefinitely