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Quarterly Financial Information (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2013
Quarterly Financial Information (unaudited)  
Schedule of selected quarterly information

The table below reflects the selected quarterly information for the years ended December 31, 2013, and 2012 (in thousands except share data):

 
   Three Months Ended  
 
   December 31,
2013		   September 30,
2013		   June 30,
2013		   March 31,
2013		  

Revenue

   $ 61,440   $ 60,635   $ 57,667   $ 55,091  

Operating income

     9,740     9,259     8,866     6,805  

Net income

     9,029     8,509     7,879     6,195  

Net income attributable to common shares

     3,135     2,901     2,618     1,849  

Net income per share attributable to common shares—basic

   $ 0.15   $ 0.14   $ 0.13   $ 0.08  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net income per share attributable to common shares—diluted

   $ 0.15   $ 0.14   $ 0.12   $ 0.08  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   


 

 
   Three Months Ended  
 
   December 31,
2012		   September 30,
2012		   June 30,
2012		   March 31,
2012		  

Revenue

   $ 55,252   $ 53,762   $ 50,636   $ 47,284  

Operating income

     5,936     5,059     3,814     2,234  

Net income

     4,578     2,947     1,848     1,343  

Net income attributable to common shares

     1,862     1,320     826     600  

Net income per share attributable to common shares—basic

   $ 0.09   $ 0.06   $ 0.04   $ 0.03  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net income per share attributable to common shares—diluted

   $ 0.09   $ 0.06   $ 0.04   $ 0.03  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​