Intangibles (Intangible Table) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	$ 94,935	$ 96,728
Accumulated Amortization	66,115	66,484
Customer lists
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	53,481	54,516
Accumulated Amortization	51,677	51,957
Developed technology
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	7,808	7,925
Accumulated Amortization	6,635	6,636
Patents
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	5,529	5,566
Accumulated Amortization	5,524	5,559
License agreements
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	1,133	1,187
Accumulated Amortization	1,133	1,187
Other
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	1,162	1,162
Accumulated Amortization	1,146	1,145
Trademarks
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Historical Cost	$ 25,822	$ 26,372

[Line Items] for Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Table]

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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