Annual report pursuant to Section 13 and 15(d)

Intangible Assets, Net and Goodwill (Narrative) (Details)

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Intangible Assets, Net and Goodwill (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Finite-Lived Intangible Assets [Line Items]      
Amortization expense $ 1,402,000 $ 1,403,000 $ 553,000
Estimated amortization expense, 2013 1,330,000    
Estimated amortization expense, 2014 1,330,000    
Estimated amortization expense, 2015 1,330,000    
Estimated amortization expense, 2016 1,330,000    
Estimated amortization expense, 2017 $ 1,330,000    
Patents And Purchased Technology [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Amortization period, in years 10 years