Goodwill and Intangible Assets (Intangible Assets Subject to Amortization) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Historical Cost	$ 182,195	$ 182,946
Accumulated Amortization	170,514	169,368
Net	$ 11,681	$ 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	$ 8,149	$ 8,199
Accumulated Amortization	7,803	7,789
Net	$ 346	$ 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 3 months 18 days	2 years 7 months 6 days
Historical Cost	$ 107,794	$ 108,417
Accumulated Amortization	98,151	97,333
Net	$ 9,643	$ 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	$ 11,911	$ 11,989
Accumulated Amortization	10,219	9,905
Net	$ 1,692	$ 2,084