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Warranties (Product Warranty Liabilities) (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2020
USD ($)
Warranties  
Warranty liabilities, December 31, 2019 $ 61,069
Warranty claims (82,359)
Warranty accruals 88,059
Warranty liabilities, September 30, 2020 $ 66,769