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Warranties (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balance, beginning of period $ 11,421 $ 10,483
Payments made (1,106) (1,222)
Provisions 1,109 1,527
Balance, end of period 11,424 10,788
Warranty expense $ 1,109 $ 1,527