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Goodwill and Intangible Assets (Intangible Assets Subject to Amortization) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]    
Historical Cost $ 183,087 $ 182,946
Accumulated Amortization 172,306 169,368
Net $ 10,781 $ 13,578
Trade names    
Finite-Lived Intangible Assets [Line Items]    
Weighted-Average Remaining   Amortization Period 3 months 18 days 3 months 18 days
Historical Cost $ 8,215 $ 8,199
Accumulated Amortization 7,901 7,789
Net $ 314 $ 410
Patent and patent licenses    
Finite-Lived Intangible Assets [Line Items]    
Weighted-Average Remaining   Amortization Period 0 years 0 years
Historical Cost $ 54,341 $ 54,341
Accumulated Amortization 54,341 54,341
Net $ 0 $ 0
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Weighted-Average Remaining   Amortization Period 2 years 2 months 12 days 2 years 7 months 6 days
Historical Cost $ 108,604 $ 108,417
Accumulated Amortization 99,652 97,333
Net $ 8,952 $ 11,084
Customer relationships | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Substantial amortization period, majority of amortization expense 4 years  
Customer relationships | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Substantial amortization period, majority of amortization expense 5 years  
Other purchased intangibles    
Finite-Lived Intangible Assets [Line Items]    
Weighted-Average Remaining   Amortization Period 1 year 3 months 18 days 1 year 9 months 18 days
Historical Cost $ 11,927 $ 11,989
Accumulated Amortization 10,412 9,905
Net $ 1,515 $ 2,084