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Cash Equivalents and Investments (Tables)
 3 Months Ended
Mar. 31, 2016
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investments

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

 

     March 31, 2016      December 31, 2015  
     Short-Term      Long-Term      Short-Term      Long-Term  

Municipal debt securities

    $ 8,543       $ 42,469       $ 8,608       $ 34,858   

Federal home loan securities

      —           25,015         —           26,715   

Certificates of deposit

      245         1,715         245         1,715   
  

 

 

     

 

 

     

 

 

     

 

 

  
   $ 8,788       $ 69,199       $ 8,853       $ 63,288   
  

 

 

     

 

 

     

 

 

     

 

 

  
Schedule of Contractual Maturities of Long-Term Investments

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

 

     March 31, 2016      December 31, 2015  

Due after one year through five years

    $ 63,973       $ 60,383   

Due after five years through seven years

      5,226         2,905   
  

 

 

     

 

 

  
   $ 69,199       $ 63,288