Product Warranty Reserves (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Product Warranty Reserves [Abstract]
Product warranty reserve term, minimum	3 months
Standard product warranty term, maximum	1 year
Product warranty reserves [Roll Forward]
Reserve balance, beginning of the period	$ 9,100	$ 10,032
Warranty liabilities accrued	3,615	4,146
Warranty liabilities settled	(2,357)	(3,384)
Other	39	(99)
Reserve balance, end of the period	$ 10,397	$ 10,695