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Property and equipment: (Tables)
 12 Months Ended
Dec. 31, 2013
Property and equipment:  
Schedule of property and equipment

Property and equipment consisted of the following (in thousands):

 
   December 31,  
 
   2013   2012  

Owned assets:

              

Network equipment

   $ 404,426   $ 375,230  

Leasehold improvements

     147,718     127,497  

System infrastructure

     79,811     71,769  

Software

     9,531     9,369  

Office and other equipment

     12,521     10,558  

Building

     1,532     1,471  

Land

     130     125  
           
​ ​ ​ ​ ​ ​ ​ ​

 

     655,669     596,019  

Less—Accumulated depreciation and amortization

     (521,290 )   (472,024 )
           
​ ​ ​ ​ ​ ​ ​ ​

 

     134,379     123,995  

Assets under capital leases:

              

IRUs

     329,415     293,210  

Less—Accumulated depreciation and amortization

     (122,601 )   (106,030 )
           
​ ​ ​ ​ ​ ​ ​ ​

 

     206,814     187,180  
           
​ ​ ​ ​ ​ ​ ​ ​

Property and equipment, net

   $ 341,193   $ 311,175  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​