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Cash Equivalents and Investments (Tables)
 9 Months Ended
Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investments

Investments held at September 30, 2016 and December 31, 2015 are summarized as follows (in thousands):

 

     September 30, 2016      December 31, 2015  
     Short-Term      Long-Term      Short-Term      Long-Term  

Municipal debt securities

    $ 9,999       $ 47,948       $ 8,608       $ 34,858   

Federal home loan securities

      —           26,748         —           26,715   

Certificates of deposit

      490         4,450         245         1,715   
  

 

 

     

 

 

     

 

 

     

 

 

  
   $ 10,489       $ 79,146       $ 8,853       $ 63,288   
  

 

 

     

 

 

     

 

 

     

 

 

  
Schedule of Contractual Maturities of Long-Term Investments

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

 

     September 30,
2016		      December 31,
2015		  

Due after one year through five years

    $ 70,867       $ 60,383   

Due after five years through seven years

      8,279         2,905   
  

 

 

     

 

 

  
   $ 79,146       $ 63,288