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Other Intangible Assets, Finite Life Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
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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 |  |

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- Definition Writeoff of fully amortized intangible assets during the period. + References No definition available. + Details
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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 + Details
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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 + Details
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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 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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