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Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income tax expense calculated at the statutory rate 20.00% 17.00%
Unused tax credits for which no deferred tax asset recognised $ 1,560  
Percentage Of Additional Corporate Income Tax Rate On Undistributed Income 5.00%  
Undistributed Earning of Foreign Subsidiaries $ 605,687  
Tax rate effect of expense not deductible in determining taxable profit (tax loss) (2.10%) 0.40%
Unused tax credits [member]    
Description of expiry date of deductible temporary differences, unused tax losses and unused tax credits 2020 to 2034  
Bottom of range [member]    
Percentage Of Additional Corporate Income Tax Rate On Undistributed Income 10.00%  
Tax rate effect of expense not deductible in determining taxable profit (tax loss) 17.00%  
Top of range [member]    
Percentage Of Additional Corporate Income Tax Rate On Undistributed Income 5.00%  
Tax rate effect of expense not deductible in determining taxable profit (tax loss) 20.00%