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Product Warranty (Tables)
 9 Months Ended
Sep. 30, 2021
Product Warranties Disclosures [Abstract]  
Product Warranty Liability Accrual
The following table provides the changes in the product warranty accrual for the three and nine months ended September 30, 2021 and 2020 (in thousands):
Three Months Ended
September 30,		Nine Months Ended
September 30,
2021202020212020
Beginning Balance$4,438 $4,815 $4,124 $6,400 
Add: Accruals for warranties issued during the period803 1,274 3,970 3,234 
Less: Settlements made during the period(1,315)(1,668)(4,168)(5,213)
Ending Balance$3,926 $4,421 $3,926 $4,421