Intangibles (Intangible Table) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	$ 90,997	$ 91,638
Accumulated Amortization	64,780	65,191
Customer lists
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	50,753	51,108
Accumulated Amortization	50,753	51,108
Developed technology
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	7,480	7,483
Accumulated Amortization	6,681	6,642
Patents
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	5,452	5,521
Accumulated Amortization	5,452	5,521
License agreements
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	2,823	2,884
Accumulated Amortization	744	770
Other
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	1,161	1,163
Accumulated Amortization	1,150	1,150
Trademarks
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	$ 23,328	$ 23,479