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Warranties - Changes in Warrants (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Warranty accrual:      
Balance, beginning of period $ 7,936 $ 8,469 $ 8,130
Payments made (8,686) (4,134) (3,978)
Provisions 11,233 3,601 4,317
Balance, end of period 10,483 7,936 8,469
Warranty expense $ 11,233 $ 3,601 $ 4,317