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Goodwill and Intangible Assets (Intangible Assets Subject to Amortization) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]      
Historical Cost $ 182,442   $ 181,649
Accumulated Amortization 173,275   171,797
Net $ 9,167   $ 9,852
Trade names      
Finite-Lived Intangible Assets [Line Items]      
Weighted-Average Remaining   Amortization Period 2 months 12 days   2 months 12 days
Historical Cost $ 8,165   $ 8,107
Accumulated Amortization 7,916   7,826
Net $ 249   $ 281
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 years 1 month 6 days
Historical Cost $ 108,016   $ 107,287
Accumulated Amortization 100,310   99,054
Net $ 7,706   $ 8,233
Customer relationships | Minimum      
Finite-Lived Intangible Assets [Line Items]      
Substantial amortization period, majority of amortization expense 4 years 4 years  
Customer relationships | Maximum      
Finite-Lived Intangible Assets [Line Items]      
Substantial amortization period, majority of amortization expense 5 years 5 years  
Other purchased intangibles      
Finite-Lived Intangible Assets [Line Items]      
Weighted-Average Remaining   Amortization Period 1 year 1 month 6 days   1 year 2 months 12 days
Historical Cost $ 11,920   $ 11,914
Accumulated Amortization 10,708   10,576
Net $ 1,212   $ 1,338