Product Warranties (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Movement in Product Warranty Liability [Roll Forward]
Balance, beginning of period	$ 2,246	$ 1,638
Accruals	1,845	1,719
Payments	(1,433)	(1,236)
Balance, end of period	$ 2,658	$ 2,121
Minimum
Product Liability Contingency [Line Items]
Product warranty period	30 days