Significant Accounting Policies Narrative (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Impairment of technology	$ 1,000
Warranty period for defects	30 days
Advertising expenses	1,000	948	1,000
Research and Development Expense [Member]
Property, Plant and Equipment [Line Items]
Impairment of technology	$ 1,000