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Marketable Securities: (Tables)
 9 Months Ended
Sep. 30, 2013
Investments, Debt and Equity Securities [Abstract]  
Reconciliation of 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