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Guarantees (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Guarantees [Abstract]
Standard warranty period (in years)	1 year
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning balance	$ 1,750	$ 1,954	$ 2,509
Provision for warranties	1,099	1,034	610
Claims made	(1,264)	(1,238)	(1,165)
Ending balance	1,585	1,750	1,954
Extended Product Warranty Disclosure [Abstract]
Product Warranty Expense	$ 4,900	$ 4,600	$ 4,100

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- Definition

Product Warranty Accrual Term

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.15(5))
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Amount of decrease in the standard and extended product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard and extended product warranty.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Amount of increase in the standard and extended product warranty accrual from warranties issued.

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The expense charged against earnings for the period pertaining to standard and extended warranties on the entity's goods and services granted to customers.

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-Publisher FASB
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