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Guarantees And Contingencies (Details) (USD $)
 1 Months Ended
Jul. 31, 2009
Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]    
Total long-term debt obligations   $ 632,800,000
Long-term debt obligations due within one year   34,276,000
Long-term debt obligations due in second and third years   114,364,000
Long-term debt obligations due in fourth and fifth years   484,160,000
Long-term debt obligations due after fifth year   0
Total operating lease obligations   150,684,000 [1]
Operating lease obligations due within one year   16,974,000 [1]
Operating lease obligations due in second and third years   57,170,000 [1]
Operating lease obligations due in fourth and fifth years   36,672,000 [1]
Operating lease obligations due after fifth year   39,868,000 [1]
Total purchase obligations   5,527,000
Purchase obligations due within one year   2,822,000
Purchase obligations due in second and third years   2,605,000
Purchase obligations due in fourth and fifth years   100,000
Purchase obligations due after fifth year   0
Total obligations   789,011,000
Total obligations due within one year   54,072,000
Total obligations due in second and third years   174,139,000
Total obligations due in fourth and fifth years   520,932,000
Total obligations due after fifth year   39,868,000
Non-cancelable sublease income   2,500,000
EasyLink Services International Corporation [Member]
    
Loss Contingencies [Line Items]    
Estimate of possible assessment   10,500,000
Amount assessed for sales tax, interest, and penalties $ 500,000  
[1] Net of $2.5 million of sublease income to be received from properties which we have subleased to third parties.