Commitments and Contingencies (Details) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Movement in Standard Product Warranty Accrual [Roll Forward]
Warranty liability balance, beginning of the period	$ 3,328,000	$ 3,954,000
Product warranty accruals	1,843,000	2,295,000
Utilization of accrual	(2,480,000)	(2,835,000)
Warranty liability balance, end of the period	2,691,000	3,414,000
Product Warranty Accrual, Current	2,000,000		2,600,000
Product Warranty Accrual, Noncurrent	$ 700,000		$ 700,000
Minimum [Member]
Product Warranty Liability [Line Items]
Warranty, Term	12 months
Maximum [Member]
Product Warranty Liability [Line Items]
Warranty, Term	24 months