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Goodwill and Intangible Assets (Details 1) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Schedule of future amortization expenses    
2013 (remaining nine months) $ 942  
2014 1,038  
2015 966  
2016 966  
2017 915  
Thereafter 4,185  
Net Carrying Amount $ 9,012 $ 7,906