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Commitments and Contingencies, Warranties (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Changes in product warranties [Roll forward]    
Balance, beginning of period $ 19,636 $ 20,929
Liabilities accrued for current year sales 26,396 21,242
Settlements of warranty claims (23,338) (21,611)
Balance, end of period $ 22,694 $ 20,560