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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating Loss Carryforwards [Line Items]                        
Income tax expense (benefit) on operations $ 920 $ 1,814 $ (6,721) $ 1,213 $ (4,249) $ 1,450 $ 9,066 $ 1,835 $ (2,774) $ 8,102 $ 11,210  
Unremitted earnings of foreign subsidiaries                     52,715  
Total operating income (loss) 5,673 $ 9,827 $ (26,823) $ 3,659 1,073 $ 9,323 $ 49,186 $ 11,699 (7,664) 71,281 67,004  
General business tax credit carry forwards, expiration date                       Dec. 31, 2025
Liability for uncertain tax positions reduction to noncurrent asset 3,449               3,449      
Unrecognized tax benefits that would impact effective tax rate 3,449       $ 3,449       3,449 3,449    
Amount affecting the Company's tax rate                 (2,252) 14,363 13,662  
Gross interest and penalties expense (benefit)                 0 (5) (13)  
Impairment of Goodwill                 0 $ 0 0  
Deferred tax liability related to earnings that are not considered indefinitely reinvested                     $ 13,750  
State and Local Jurisdiction [Member]                        
Operating Loss Carryforwards [Line Items]                        
Net operating loss carry forwards 74,474               74,474      
General business and foreign tax credit carry forwards 1,792               1,792      
Foreign Tax Authority [Member]                        
Operating Loss Carryforwards [Line Items]                        
Net operating loss carry forwards 30,991               30,991      
General business and foreign tax credit carry forwards 1,348               1,348      
U.S. Federal [Member]                        
Operating Loss Carryforwards [Line Items]                        
Total operating income (loss)                 (15,801)      
General business and foreign tax credit carry forwards $ 19,810               $ 19,810      
Maximum [Member] | State and Local Jurisdiction [Member]                        
Operating Loss Carryforwards [Line Items]                        
Operating loss carry forwards, expiration dates                 Dec. 31, 2040      
Maximum [Member] | Foreign Tax Authority [Member]                        
Operating Loss Carryforwards [Line Items]                        
Operating loss carry forwards, expiration dates                 Dec. 31, 2025      
Minimum [Member] | State and Local Jurisdiction [Member]                        
Operating Loss Carryforwards [Line Items]                        
Operating loss carry forwards, expiration dates                 Dec. 31, 2024      
Minimum [Member] | Foreign Tax Authority [Member]                        
Operating Loss Carryforwards [Line Items]                        
Operating loss carry forwards, expiration dates                 Dec. 31, 2021