Other Intangible Assets, Finite Life Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite Life Intangible Assets [Abstract]
Gross carrying amount	$ 181,553	$ 140,915
Accumulated amortization	$ 119,926	101,631
Weighted-average amortization period	14 years
Amortization expense	$ 18,300	8,100	$ 8,400
Scanner Technology [Member]
Finite Life Intangible Assets [Abstract]
Gross carrying amount	46,482	46,482
Accumulated amortization	$ 42,690	39,657
Weighted-average amortization period	18 years
Developed Technology [Member]
Finite Life Intangible Assets [Abstract]
Gross carrying amount	$ 22,500	22,500
Accumulated amortization	$ 20,032	19,207
Weighted-average amortization period	20 years
Distributor 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	$ 5,823	2,785
Accumulated amortization	$ 1,812	1,197
Weighted-average amortization period	11 years
Other [Member]
Finite Life Intangible Assets [Abstract]
Gross carrying amount	$ 95,150	57,550
Accumulated amortization	$ 43,794	$ 29,972
Weighted-average amortization period	10 years

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.

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-Name Accounting Standards Codification
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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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- Definition

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

+ References

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-Publisher FASB
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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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
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