Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Movement in Standard Product Warranty Accrual [Roll Forward]
Warranty liability balance, beginning of the period	$ 3,438	$ 3,025
Product warranty accruals	1,759	1,286
Utilization of accrual	(2,301)	(1,521)
Warranty liability balance, end of the period	$ 2,896	$ 2,790
Minimum [Member]
Product Warranty Liability [Line Items]
Standard Product Warranty, Term	12 months
Contract Manufacturers Standard Product Warranty, Term	12 months
Maximum [Member]
Product Warranty Liability [Line Items]
Standard Product Warranty, Term	24 months
Contract Manufacturers Standard Product Warranty, Term	15 months