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Segment Information and Concentrations of Risk (Details 1) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Assets By Geographic Concentration    
Assets by Geographic Concentration, Total $ 155,683 $ 161,531
United States [Member]
   
Assets By Geographic Concentration    
Assets by Geographic Concentration, Total 151,739 157,661
Canada [Member]
   
Assets By Geographic Concentration    
Assets by Geographic Concentration, Total 3,011 2,836
Europe, Latin America and Asia [Member]
   
Assets By Geographic Concentration    
Assets by Geographic Concentration, Total $ 933 $ 1,034