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Cash Equivalents and Investments: (Tables)
 3 Months Ended
Mar. 31, 2014
Investments Debt And Equity Securities [Abstract]  
Schedule of Investments

Investments held at March 31, 2014 and December 31, 2013 are summarized as follows (in thousands):

 

     March 31, 2014      December 31, 2013  
     Short-Term      Long-Term      Short-Term      Long-Term  

Municipal debt securities

    $ 6,760       $ 36,518       $ 5,492       $ 34,495   

Federal home loan securities

      —           19,498         —           22,520   

Certificates of deposit

      965         496         965         496   
  

 

 

     

 

 

     

 

 

     

 

 

  
   $ 7,725       $ 56,512       $ 6,457       $ 57,511