v3.26.1
Goodwill and Intangible Assets (Intangible Assets Subject to Amortization) (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Intangible Asset, Finite-Lived [Line Items]    
Historical Cost $ 186,140 $ 184,220
Accumulated Amortization 177,366 176,926
Net $ 8,774 $ 7,294
Trade names    
Intangible Asset, Finite-Lived [Line Items]    
Weighted-Average Remaining   Amortization Period 1 month 6 days 1 month 6 days
Historical Cost $ 8,248 $ 8,299
Accumulated Amortization 8,162 8,148
Net $ 86 $ 151
Patent and patent licenses    
Intangible Asset, Finite-Lived [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 [Member]    
Intangible Asset, Finite-Lived [Line Items]    
Weighted-Average Remaining   Amortization Period 1 year 4 months 24 days 1 year 7 months 6 days
Historical Cost $ 109,339 $ 109,663
Accumulated Amortization 103,913 103,616
Net $ 5,426 $ 6,047
Customer Relationships [Member] | Minimum    
Intangible Asset, Finite-Lived [Line Items]    
Substantial amortization period, majority of amortization expense 4 years 4 years
Customer Relationships [Member] | Maximum    
Intangible Asset, Finite-Lived [Line Items]    
Substantial amortization period, majority of amortization expense 5 years 5 years
Other purchased intangibles    
Intangible Asset, Finite-Lived [Line Items]    
Weighted-Average Remaining   Amortization Period 1 year 10 months 24 days 1 year
Historical Cost $ 14,212 $ 11,917
Accumulated Amortization 10,950 10,821
Net $ 3,262 $ 1,096