Intangibles (Intangible Table) (Details) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	$ 92,276,000	$ 90,005,000
Accumulated Amortization	61,454,000	59,005,000
Customer lists
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	51,602,000	49,858,000
Accumulated Amortization	47,510,000	45,019,000
Developed technology
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	7,577,000	7,405,000
Accumulated Amortization	6,145,000	5,921,000
Patents
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	5,540,000	5,959,000
Accumulated Amortization	5,500,000	5,843,000
License agreements
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	1,163,000	1,098,000
Accumulated Amortization	1,163,000	1,098,000
Other
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	1,161,000	1,161,000
Accumulated Amortization	1,136,000	1,124,000
Trademarks
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	$ 25,233,000	$ 24,524,000