Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Income Taxes (Narrative) (Details)

v3.8.0.1
Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2012
Dec. 31, 2011
Unrecognized tax benefits $ 28,037   $ 28,037 $ 18,000 $ 13,930 $ 8,552    
Accrued interest and penalties related to uncertain tax positions 942   $ 942          
Statutory tax rates     24.00% 25.00% 26.50%      
Privileged enterprise benefits rate     24.00%          
Tax-exempt income     $ 229,400          
Change in corporate tax rate, amount incurred     $ 22,900          
Reduced Corporate Tax Rate     7.50%          
Decrease In Tax Rates In Year Thereafter             16.00%  
Special Preferred Enterprise Of Reduced Tax Rates 1     20.00%       16.00% 16.00%
Special Preferred Enterprise Of Reduced Tax Rates 2               9.00%
Operating losses carryforwards       $ 5,000        
Deferred tax asset 114,107   $ 114,107 139,914        
Valuation allowance of deferred tax assets 152,062   $ 152,062 201,376        
Valuation allowance and deferred tax assets tax rate     21.00%          
Change in valuation allowance 65,600              
Change in deferred tax assets 65,600   $ (2,404) $ 10,378 $ 19,129      
Foreign ownership percentage basis for determining tax rate     90.00%          
Special Preferred Enterprise Tax Exempt Period     10 years          
Approved enterprise and beneficiary enterprise income tax exempt or taxable rate     10.00%          
Dividend withholding tax rate     15.00%          
Persentage of limitation uses     80.00%          
Israel [Member]                
Statutory tax rates     24.00% 25.00% 26.50% 26.50%    
Israel [Member] | Subsequent Event [Member]                
Statutory tax rates   23.00%            
United States [Member]                
Statutory tax rates     21.00%          
HONG KONG                
Statutory tax rates     16.50%          
GERMANY                
Statutory tax rates     28.00%          
Minimum [Member]                
Reduced Corporate Tax Rate     21.00%          
Foreign ownership percentage basis for determining tax rate     10.00%          
Maximum [Member]                
Reduced Corporate Tax Rate     35.00%          
Foreign ownership percentage basis for determining tax rate     25.00%          
Dividend withholding tax rate     30.00%          
Subsidiaries [Member]                
Operating losses carryforwards 486,000   $ 486,000 $ 381,000        
Deferred tax asset 114,000   114,000 $ 140,000        
Deferred tax liability $ 125,500   $ 125,500