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Cash Equivalents and Investments (Tables)
 6 Months Ended
Jun. 30, 2013
Investments Debt And Equity Securities [Abstract]  
Schedule of Investments

Investments held at June 30, 2013 and December 31, 2012 are summarized as follows (in thousands):

 

     June 30, 2013      December 31, 2012  
     Short-Term      Long-Term      Short-Term      Long-Term  

Municipal debt securities

    $ 6,041       $ 34,568       $ 6,088       $ 27,563   

Federal home loan securities

      —           24,542         —           18,569   

Certificates of deposit

      968         741         496         1,461   
  

 

 

     

 

 

     

 

 

     

 

 

  
   $ 7,009       $ 59,851       $ 6,584       $ 47,593