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Geographic information:
 12 Months Ended
Dec. 31, 2013
Geographic information:  
Geographic information:

10. Geographic information:

        Operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision maker in deciding how to allocate resources and in assessing the Company's performance. The Company has one operating segment. Below are the Company's service revenues and long lived assets by geographic region (in thousands):

 
   Years Ended December 31,  
 
   2013   2012   2011  

Service Revenue

                    

North America

   $ 274,320   $ 253,396   $ 240,116  

Europe

     73,659     63,577     65,384  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 347,979   $ 316,973   $ 305,500  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               


 

 
   December 31,
2013		   December 31,
2012		  

Long lived assets, net

              

North America

   $ 251,352   $ 225,060  

Europe

     89,879     86,162  
           
​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 341,231   $ 311,222  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
           

        The majority of North American revenue consists of services delivered within the United States.