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Discontinued Operations
 9 Months Ended
Sep. 30, 2013
Discontinued Operations and Disposal Groups [Abstract]  
Discontinued Operations
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Discontinued Operations.  In January 2012, our Board of Directors approved the shutdown of our DSL service assurance hardware product line which was previously a component of our DSL Service Assurance Segment. We completed the shutdown in 2012 and no longer have any continuing involvement with or cash flows from this product line. The results of our DSL service assurance hardware product line have been included in discontinued operations in the consolidated statements of comprehensive income. Income from discontinued operations attributable to the DSL service assurance hardware product line was (in thousands):
   
Three Months Ended
September 30,
      
Nine Months Ended
September 30,
  
   
2013
    
2012
    
2013
    
2012
  
                         
Revenue
   $ -     $ 724     $ -     $ 2,809  
Expenses
     -       364       -       2,206  
Income before income taxes
     -       360       -       603  
Income taxes
     -       143       -       243  
Income from discontinued operations
   $ -     $ 217     $ -     $ 360