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Revenue Recognition Movement in Standard Product Warranty Accrual (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Product Warranty Liability [Line Items] |  |
Contract with Customer, Right to Recover Product | $ 56,000 | $ 56,000
Contract with Customer, Refund Liability | 105,000 | 105,000
Revenue, Variable Consideration Reserve | 66,000 | 103,000
Deferred Service-Type Warranty Revenue | 25,511 | $ 24,006
Deferred Revenue, Additions | 10,875 |
Deferred Revenue, Revenue Recognized | $ (9,370) |
Minimum |  |
Product Warranty Liability [Line Items] |  |
Standard Product Warranty Period | 6 months |
Maximum |  |
Product Warranty Liability [Line Items] |  |
Standard Product Warranty Period | 36 months |

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- Definition Amount of liability for consideration received or receivable from customer which is not included in transaction price, when consideration is expected to be refunded to customer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 55 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=96862333&loc=SL49130609-203046-203046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 55 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=96862333&loc=SL49130607-203046-203046 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 32 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82859839&loc=SL51751984-203043 + Details
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- Definition Amount of right to recover product from customer on settling refund liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 55 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=96862333&loc=SL49130607-203046-203046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 55 -Paragraph 27 -URI http://asc.fasb.org/extlink&oid=96862333&loc=SL49130611-203046-203046 + Details
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