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Changes in Warranty Reserve (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Warranty Reserve [Roll Forward]    
Beginning balance $ 23,262 $ 23,151
Warranty expense 58,253 43,682
Warranty claims (56,074) (43,571)
Ending balance $ 25,441 $ 23,262