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Commitments and Contingencies, Warranties (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Changes in product warranties [Roll forward]        
Balance, beginning of period $ 23,224 $ 22,694 $ 22,445 $ 19,636
Liabilities accrued for current year sales 22,795 24,283 44,862 50,679
Settlements of warranty claims (19,522) (24,891) (40,810) (48,229)
Balance, end of period $ 26,497 $ 22,086 $ 26,497 $ 22,086