Warranty (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Product Warranty Liability [Line Items]
Current liability warranty reserve balance	$ 5,235	$ 5,566
Minimum
Product Warranty Liability [Line Items]
Warranty claim lag period	90 days
Maximum
Product Warranty Liability [Line Items]
Warranty claim lag period	6 months