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Cash Equivalents and Investments (Tables)
 6 Months Ended
Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investments

Investments held at June 30, 2018 and December 31, 2017 are summarized as follows (in thousands):

 

     June 30, 2018      December 31, 2017  
     Short-Term      Long-Term      Short-Term      Long-Term  

Municipal debt securities

    $ 8,432      $ 48,613      $ 8,312      $ 46,195  

Federal home loan securities

      —          36,393        1,000        30,322  

Certificates of deposit

      1,470        5,180        980        4,165  
  

 

 

     

 

 

     

 

 

     

 

 

  
   $ 9,902      $ 90,186      $ 10,292      $ 80,682  
  

 

 

     

 

 

     

 

 

     

 

 

  
Schedule of Contractual Maturities of Long-Term Investments

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

 

     June 30, 2018      December 31, 2017  

Due after one year through five years

    $ 89,186      $ 78,561  

Due after five years through six years

      1,000        2,121  
  

 

 

     

 

 

  
   $ 90,186      $ 80,682