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Warranties (Product Warranty Liabilities) (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2020
USD ($)
Warranties  
Warranty liabilities, December 31, 2019 $ 61,069
Warranty claims (50,598)
Warranty accruals 60,522
Warranty liabilities, June 30, 2020 $ 70,993