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Investments
 12 Months Ended
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]  
Investments

3.    Investments:

Investments held are summarized as follows (in thousands):

 

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

Municipal debt securities

    $ 10,306       $ 46,513       $ 8,608       $ 34,858   

Federal home loan securities

      —           28,747         —           26,715   

Certificates of deposit

      980         3,715         245         1,715   
  

 

 

     

 

 

     

 

 

     

 

 

  
   $ 11,286       $ 78,975       $ 8,853       $ 63,288   
  

 

 

     

 

 

     

 

 

     

 

 

  

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

 

     December 31,  
     2016      2015  

Due after one year through five years

    $ 70,005       $ 60,383   

Due after five years through seven years

      8,970         2,905   
  

 

 

     

 

 

  
   $ 78,975       $ 63,288