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Goodwill and Intangible Assets (Intangible Assets Subject to Amortization) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2023
Jun. 30, 2022
Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]      
Historical Cost $ 181,967   $ 181,604
Accumulated Amortization 165,269   163,830
Net $ 16,698   17,774
Minimum      
Finite-Lived Intangible Assets [Line Items]      
Weighted-Average Remaining   Amortization Period 1 year    
Maximum      
Finite-Lived Intangible Assets [Line Items]      
Weighted-Average Remaining   Amortization Period 20 years    
Trade names      
Finite-Lived Intangible Assets [Line Items]      
Weighted-Average Remaining   Amortization Period 4 months 24 days 6 months  
Historical Cost $ 8,178   8,151
Accumulated Amortization 7,666   7,605
Net $ 512   546
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 3 years 3 years 1 month 6 days  
Historical Cost $ 107,512   107,175
Accumulated Amortization 93,788   92,573
Net $ 13,724   14,602
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 2 years 2 years  
Historical Cost $ 11,936   11,937
Accumulated Amortization 9,474   9,311
Net $ 2,462   $ 2,626