Intangibles (Intangible Table) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	$ 96,743	$ 91,638
Accumulated Amortization	68,973	65,191
Customer lists
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	54,267	51,108
Accumulated Amortization	54,267	51,108
Developed technology
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	7,918	7,483
Accumulated Amortization	7,150	6,642
Patents
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	5,514	5,521
Accumulated Amortization	5,514	5,521
License agreements
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	2,864	2,884
Accumulated Amortization	891	770
Other
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	1,161	1,163
Accumulated Amortization	1,151	1,150
Trademarks
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	$ 25,019	$ 23,479