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Warranties (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Movement in Standard Product Warranty Accrual [Roll Forward]        
Balance, beginning of period $ 8,454 $ 8,092 $ 8,469 $ 8,130
Payments made (1,331) (1,130) (2,988) (3,133)
Provisions 1,012 1,289 2,654 3,254
Balance, end of period 8,135 8,251 8,135 8,251
Warranty expense $ 1,012 $ 1,289 $ 2,654 $ 3,254