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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Taxes [Line Items]        
Tax Cuts And Jobs Act Of 2017, income tax benefit $ 800   $ (2,200)  
Income tax benefit related to net operating loss   $ 3,900    
Deferred tax liabilities, undistributed foreign earnings 1,600 1,600 1,800  
Tax Cuts and Jobs Act of 2017, incomplete accounting, provisional undistributed accumulated earnings of foreign subsidiary 17,500 17,500 25,500  
Global intangible low-taxed income recognized   15,600    
Valuation allowance adjustment   (2,200)    
Valuation allowance 14,455 14,455 12,434  
Tax Cuts And Jobs Act Of 2017, deferred tax asset, valuation allowance 2,100 2,100 1,000  
Undistributed earnings of foreign subsidiaries 143,000 143,000 112,100  
Unremitted earnings withholding taxes 1,800 1,800    
Additional unremitted earnings withholding taxes 17,600 17,600    
Net income taxes paid   7,300 4,100 $ 3,900
Unrecognized tax benefits, income tax penalties and interest accrued 100 100 100 300
Unrecognized tax benefits that would impact effective tax rate 900 900 800 $ 700
Maximum        
Income Taxes [Line Items]        
Expected change in unrecognized tax benefits statute lapse 200 200    
Unrecognized tax benefits, potential settlement 200 $ 200    
State and Local Jurisdiction | Minimum        
Income Taxes [Line Items]        
Statutes of limitations range   3 years    
State and Local Jurisdiction | Maximum        
Income Taxes [Line Items]        
Statutes of limitations range   4 years    
Foreign Tax Authority | Minimum        
Income Taxes [Line Items]        
Increase in unrecognized tax benefits is reasonably possible 100 $ 100    
Statutes of limitations range   3 years    
Foreign Tax Authority | Maximum        
Income Taxes [Line Items]        
Increase in unrecognized tax benefits is reasonably possible 200 $ 200    
Statutes of limitations range   10 years    
United States        
Income Taxes [Line Items]        
Valuation allowance 12,300 $ 12,300 10,100  
United States | State and Local Jurisdiction        
Income Taxes [Line Items]        
Valuation allowance 8,057 8,057 7,092  
Net Operating and Capital Loss Carryforward        
Income Taxes [Line Items]        
Valuation allowance 2,200 2,200 2,300  
Net Operating and Capital Loss Carryforward | State and Local Jurisdiction        
Income Taxes [Line Items]        
Valuation allowance $ 1,000 1,000 $ 2,100  
Pacific Instruments, Inc.        
Income Taxes [Line Items]        
Valuation allowance adjustment   $ 1,600