Product Warranties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 5,856	$ 5,343
Warranties issued	9,608	8,640
Settlements made	(9,357)	(8,127)
Balance at end of period	$ 6,107	$ 5,856