Product Warranty Reserves (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Product warranty reserves [Roll Forward]
Reserve balance, beginning of the period	$ 10,397	$ 10,695	$ 9,100	$ 10,032
Warranty liabilities accrued	4,685	4,316	8,300	8,462
Warranty liabilities settled	(3,212)	(4,287)	(5,569)	(7,671)
Other	(12)	37	27	(62)
Reserve balance, end of the period	$ 11,858	$ 10,761	$ 11,858	$ 10,761
Minimum [Member]
Product Warranty Liability [Line Items]
Product warranty reserve term			3 months
Maximum [Member]
Product Warranty Liability [Line Items]
Product warranty reserve term			1 year