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Comprehensive Income [Tables]
3 Months Ended
Mar. 31, 2012
Comprehensive Income [Abstract]  
Comprehensive Income
                                 
     Three Months Ended     Nine Months Ended  
    March 31,     March 31,  
    2012     2011     2012     2011  

Net income

  $ 11,446     $ 13,496     $ 41,844     $ 49,873  

Net unrealized gain on available-for-sale investments, net of tax

    1,820       716       13       1,396  
   

 

 

   

 

 

   

 

 

   

 

 

 

Total comprehensive income

  $ 13,266     $ 14,212     $ 41,857     $ 51,269