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DSL Service Assurance Software Exit - A rollforward of our exit costs liability accounts (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Restructuring Reserve [Roll Forward]    
Balance at June 30, 2013     
Amount charged to expense 2,832 2,832
Deferred revenue obligations 1,179  
Payments/write-offs (223)  
Balance at September 30, 2013 3,788 3,788
Customer Contract Termination Costs
    
Restructuring Reserve [Roll Forward]    
Balance at June 30, 2013     
Amount charged to expense 2,553  
Deferred revenue obligations 1,179  
Payments/write-offs     
Balance at September 30, 2013 3,732 3,732
Severance and Employee-Related Costs
    
Restructuring Reserve [Roll Forward]    
Balance at June 30, 2013     
Amount charged to expense 232  
Deferred revenue obligations     
Payments/write-offs (176)  
Balance at September 30, 2013 56 56
Other Costs
    
Restructuring Reserve [Roll Forward]    
Balance at June 30, 2013     
Amount charged to expense 47  
Deferred revenue obligations     
Payments/write-offs (47)  
Balance at September 30, 2013