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Warranties (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Movement in Standard Product Warranty Accrual [Roll Forward]        
Balance, beginning of period $ 10,788 $ 7,812 $ 10,483 $ 7,936
Payments made (2,504) (2,312) (3,723) (3,654)
Provisions 3,174 3,102 4,698 4,320
Balance, end of period 11,458 8,602 11,458 8,602
Warranty expense $ 3,174 $ 3,102 $ 4,698 $ 4,320