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Income Taxes (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Income Taxes [Line Items]        
Cumulative undistributed earnings of foreign subsidiaries       $ 330,000
Income tax incentives   $ 3,028 $ 6,590  
Net impact of tax incentives, per diluted share   $ 0.08 $ 0.14  
Unrecognized tax benefits including interest and penalties   $ 400    
Accrued income tax penalties and interest on unrecognized tax benefits   100    
State And Local Jurisdiction [Member]        
Income Taxes [Line Items]        
Income tax expense on foreign earnings expected to be repatriated $ 9,400      
Foreign Country [Member]        
Income Taxes [Line Items]        
Income tax expense on foreign earnings expected to be repatriated $ 30,700      
China [Member]        
Income Taxes [Line Items]        
Income tax incentives   $ 0 $ 969  
Malaysia [Member}        
Income Taxes [Line Items]        
Income tax holidays expiration date   2021    
Income tax incentives   $ 1,486 2,551  
Thailand [Member]        
Income Taxes [Line Items]        
Income tax holidays expiration date   2028    
Income tax incentives   $ 1,542 $ 3,070