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Warranties (Tables)
9 Months Ended
Sep. 30, 2020
Warranties  
Changes in product warranty liabilities

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Warranty liabilities, balance at December 31, 2019

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$

61,069

Warranty claims

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(82,359)

Warranty accruals

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88,059

Warranty liabilities, balance at September 30, 2020

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$

66,769