Intangibles - Finite and Indefinite Lived Intangibles (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	$ 90,005,000	$ 125,244,000
Accumulated Amortization	59,005,000	87,231,000
Customer lists
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	49,858,000	78,693,000
Accumulated Amortization	45,019,000	71,343,000
License agreements
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	1,098,000	1,290,000
Accumulated Amortization	1,098,000	1,290,000
Developed technology
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	7,405,000	8,297,000
Accumulated Amortization	5,921,000	6,340,000
Patents
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	5,959,000	6,102,000
Accumulated Amortization	5,843,000	5,804,000
Other
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	1,161,000	2,548,000
Accumulated Amortization	1,124,000	2,454,000
Trademarks
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	$ 24,524,000	$ 28,314,000