Cash Equivalents and Investments (Tables)
 3 Months Ended
Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investments

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

 

     March 31, 2015      December 31, 2014  
     Short-Term      Long-Term      Short-Term      Long-Term  

Municipal debt securities

    $ 6,273       $ 35,316       $ 5,539       $ 35,827   

Federal home loan securities

      —           27,261         —           27,030   

Certificates of deposit

      496         1,225         496         1,225   
  

 

 

     

 

 

     

 

 

     

 

 

  
$ 6,769    $ 63,802    $ 6,035    $ 64,082   
  

 

 

     

 

 

     

 

 

     

 

 

  
Schedule of Contractual Maturities of Long-Term Investments

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

 

     March 31, 2015      December 31, 2014  

Due after one year through five years

    $ 59,552       $ 54,959   

Due after five years through seven years

      4,250         9,123   
  

 

 

     

 

 

  
$ 63,802    $ 64,082