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Commitments and Contingencies, Warranties (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Changes in product warranties [Roll forward]    
Balance, beginning of period $ 22,445 $ 19,636
Liabilities accrued for current year sales 22,067 26,396
Settlements of warranty claims (21,288) (23,338)
Balance, end of period $ 23,224 $ 22,694