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Commitments and Contingencies, Warranties (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Changes in product warranties [Roll forward]        
Balance, beginning of period $ 16,948 $ 17,232 $ 17,663 $ 17,175
Liabilities accrued for current year sales 25,162 22,795 45,339 44,862
Settlements of warranty claims (23,897) (22,267) (44,789) (44,277)
Balance, end of period $ 18,213 $ 17,760 $ 18,213 $ 17,760