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Cash Equivalents and Investments (Tables)
 9 Months Ended
Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investments

Investments held at September 30, 2017 and December 31, 2016 are summarized as follows (in thousands):

 

     September 30, 2017      December 31, 2016  
     Short-Term      Long-Term      Short-Term      Long-Term  

Municipal debt securities

    $ 7,009      $ 46,624      $ 10,306      $ 46,513  

Federal home loan securities

      2,250        31,496        —          28,747  

Certificates of deposit

      1,715        4,165        980        3,715  
  

 

 

     

 

 

     

 

 

     

 

 

  
   $ 10,974      $ 82,285      $ 11,286      $ 78,975  
  

 

 

     

 

 

     

 

 

     

 

 

  

 
Schedule of Contractual Maturities of Long-Term Investments

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

 

     September 30, 2017      December 31, 2016  

Due after one year through five years

    $ 79,078      $ 70,005  

Due after five years through six years

      3,207        8,970  
  

 

 

     

 

 

  
   $ 82,285      $ 78,975