Intangibles (Intangible Table) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	$ 91,364	$ 91,638
Accumulated Amortization	65,186	65,191
Customer lists
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	50,985	51,108
Accumulated Amortization	50,985	51,108
Developed technology
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	7,488	7,483
Accumulated Amortization	6,730	6,642
Patents
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	5,496	5,521
Accumulated Amortization	5,496	5,521
License agreements
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	2,850	2,884
Accumulated Amortization	824	770
Other
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	1,162	1,163
Accumulated Amortization	1,151	1,150
Trademarks
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	$ 23,383	$ 23,479