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Cash Equivalents and Investments: (Tables)
 3 Months Ended
Mar. 31, 2013
Schedule of Investments

Investments held at March 31, 2013 and December 31, 2012 are summarized as follows (in thousands):

 

     March 31, 2013      December 31, 2012  
     Short-Term      Long-Term      Short-Term      Long-Term  

Municipal debt securities

    $ 5,039       $ 32,631       $ 6,088       $ 27,563   

Federal home loan securities

      —           24,553         —           18,569   

Certificates of deposit

      496         1,461         496         1,461   
  

 

 

     

 

 

     

 

 

     

 

 

  
   $ 5,535       $ 58,645       $ 6,584       $ 47,593