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Warranties (Product Warranty Liabilities) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Warranties    
Warranty liabilities, beginning balance $ 52,220 $ 44,398
Warranty claims (99,267) (89,557)
Warranty accruals 108,116 97,379
Warranty liabilities, ending balance $ 61,069 $ 52,220