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Cash Equivalents and Investments (Tables)
 9 Months Ended
Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investments

Investments held at September 30, 2015 and December 31, 2014 are summarized as follows (in thousands):

 

     September 30, 2015      December 31, 2014  
     Short-Term      Long-Term      Short-Term      Long-Term  

Municipal debt securities

    $ 7,773       $ 35,089       $ 5,539       $ 35,827   

Federal home loan securities

      —           22,221         —           27,030   

Certificates of deposit

      248         1,960         496         1,225   
  

 

 

     

 

 

     

 

 

     

 

 

  
   $ 8,021       $ 59,270       $ 6,035       $ 64,082   
  

 

 

     

 

 

     

 

 

     

 

 

 
Schedule of Contractual Maturities of Long-Term Investments

Contractual maturities of long-term investments are summarized as follows (in thousands):

 

     September 30, 2015      December 31, 2014  

Due after one year through five years

    $ 55,353       $ 54,959   

Due after five years through seven years

      3,917         9,123   
  

 

 

     

 

 

  
   $ 59,270       $ 64,082