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DSL Service Assurance Software Exit (Tables)
9 Months Ended
Sep. 30, 2013
Digital Subscriber Line Service Assurance Software Exit [Abstract]  
Schedule of roll forward of exit costs liability
 
   
Customer
Contract
Termination Costs
   
Severance
and Employee-Related Costs
   
Other
Costs
   
Total
 
Balance at June 30, 2013
  $ -     $ -     $ -     $ -  
Amount charged to expense
    2,553       232       47       2,832  
Deferred revenue offset
    1,179       -       -       1,179  
Payments/write-offs
    -       (176 )     (47 )     (223 )
Balance at September 30, 2013
  $ 3,732     $ 56     $ -     $ 3,788