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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Loss Carryforwards [Line Items]                      
Income tax expense (benefit) on operations $ 690 $ 3,467 $ 3,820 $ 3,233 $ (6,036) $ 3,809 $ 5,189 $ 4,571 $ 11,210 $ 7,533 $ (36,389)
Effective income tax rate                 17.20% 14.30% (92.80%)
Unremitted earnings of foreign subsidiaries 55,707               $ 55,707    
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability                   $ (15,269)  
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount                   6,207  
Income tax expense (benefit) due to Tax Cuts and Jobs Act 710 $ (131)               $ (9,062)  
General business tax credit carry forwards, expiration date                   Dec. 31, 2024  
Reduction of noncurrent deferred tax asset                   $ (15,269)  
Liability for uncertain tax positions reduction to noncurrent asset 3,449               3,449    
Liability for uncertain tax positions, noncurrent 32               32    
Unrecognized tax benefits that would impact effective tax rate 3,481       3,645       3,481 3,645  
Gross interest and penalties expense (benefit)                 (13) (33) $ (59)
Accrued payment of interest and penalties 19       $ 32       19 32  
Impairment of Goodwill                 0 $ 0 $ 0
State and Local Jurisdiction [Member]                      
Operating Loss Carryforwards [Line Items]                      
Net operating loss carry forwards 64,189               64,189    
General business and foreign tax credit carry forwards 1,493               1,493    
Foreign Tax Authority [Member]                      
Operating Loss Carryforwards [Line Items]                      
Net operating loss carry forwards 24,745               24,745    
General business and foreign tax credit carry forwards 1,324               1,324    
U.S. Federal [Member]                      
Operating Loss Carryforwards [Line Items]                      
General business and foreign tax credit carry forwards $ 23,404               $ 23,404