Product Warranties (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Mar. 31, 2013	Sep. 30, 2014	Sep. 30, 2013
Product Warranties Disclosures [Abstract]
Maximum product warranty term				3 years
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance, beginning of period	$ 3,363	$ 2,683	$ 4,455	$ 2,965	$ 4,455
Charges to operations	344	320		1,170	1,025
Deductions for costs incurred	(476)	(142)		(826)	(1,308)
Changes in estimates	49	(5)	(800)	(29)	(1,316)
Balance, end of period	$ 3,280	$ 2,856		$ 3,280	$ 2,856