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Marketable Securities:
 9 Months Ended
Sep. 30, 2013
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities:
Marketable Securities:
Marketable securities consist of the following:
 
September 30,
2013
 
December 31,
2012
Government debt securities, at par value
$
—

 
$
23,769

Less discount
—

 
(102
)
 
—

 
23,667

Unrealized gain
—

 
685

Fair value (Level 1 measurement)
$
—

 
$
24,352


The proceeds from maturities and interest receipts from the marketable securities were restricted to the service of the Greeley Note (See Note 10—Bank and Other Notes Payable). On September 1, 2013, the Greeley note was paid off in full.