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Segment Information and Concentrations of Risk (Details 1) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Assets By Geographic Concentration    
Assets by Geographic Concentration, Total $ 200,421 $ 249,179
United States [Member]
   
Assets By Geographic Concentration    
Assets by Geographic Concentration, Total 194,200 243,030
Canada [Member]
   
Assets By Geographic Concentration    
Assets by Geographic Concentration, Total 4,717 4,764
Europe Latin America and Asia [Member]
   
Assets By Geographic Concentration    
Assets by Geographic Concentration, Total $ 1,504 $ 1,385