Other Intangible Assets, Finite Life Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite Life Intangible Assets [Abstract]
Gross carrying amount	$ 140,915	$ 129,391
Accumulated amortization	$ 101,630	94,200
Weighted-average amortization period	15 years
Amortization expense	$ 8,100	8,400	$ 8,600
Write-off of fully amortized intangible assets		12,000
Scanner Technology [Member]
Finite Life Intangible Assets [Abstract]
Gross carrying amount	46,482	46,482
Accumulated amortization	$ 39,657	36,624
Weighted-average amortization period	18 years
Developed Technology [Member]
Finite Life Intangible Assets [Abstract]
Gross carrying amount	$ 22,500	22,500
Accumulated amortization	$ 19,207	18,383
Weighted-average amortization period	20 years
Distribution Network [Member]
Finite Life Intangible Assets [Abstract]
Gross carrying amount	$ 11,598	11,598
Accumulated amortization	$ 11,598	11,598
Weighted-average amortization period	15 years
Trademarks [Member]
Finite Life Intangible Assets [Abstract]
Gross carrying amount	$ 2,785	2,592
Accumulated amortization	$ 1,197	1,011
Weighted-average amortization period	15 years
Other [Member]
Finite Life Intangible Assets [Abstract]
Gross carrying amount	$ 57,550	46,219
Accumulated amortization	$ 29,971	$ 26,584
Weighted-average amortization period	8 years

Writeoff of fully amortized intangible assets during the period.

No definition available.

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- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

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

+ Details

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- Definition

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

+ References

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- References

No definition available.

+ Details

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- Details

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