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Warranties (Product Warranty Liabilities) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
Warranties  
Warranty liabilities, December 31, 2019 $ 61,069
Warranty claims (23,375)
Warranty accruals 22,901
Warranty liabilities, March 31, 2020 $ 60,595