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Marketable Securities:
 6 Months Ended
Jun. 30, 2012
Marketable Securities:  
Marketable Securities:

7. Marketable Securities:

        Marketable securities consist of the following:

 
   June 30,
2012 		  December 31,
2011 		 

Government debt securities, at par value

   $ 24,458   $ 25,147  

Less discount

     (201 )   (314 )
           

 

     24,257     24,833  

Unrealized gain

     1,228     1,803  
           

Fair value (Level 1 measurement)

   $ 25,485   $ 26,636  
           

        Future contractual maturities of marketable securities are as follows:

1 year or less

   $ 1,378  

2 to 5 years

     23,080  
       

 

   $ 24,458  
       

        The proceeds from maturities and interest receipts from the marketable securities are restricted to the service of the Greeley Note (See Note 11—Bank and Other Notes Payable).