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Marketable Securities:
 12 Months Ended
Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities:
Marketable Securities:
Marketable securities at December 31, 2013 and 2012 consists of the following:
 
2013
 
2012
Government debt securities, at par value
$
—

 
$
23,769

Less discount
—

 
(102
)
 
—

 
23,667

Unrealized gain
—

 
685

Fair value
$
—

 
$
24,352


The proceeds from maturities and interest receipts from the marketable securities were restricted to the service of the Greeley Note (See Note 11—Bank and Other Notes Payable). On September 1, 2013, the Greeley note was paid off in full.