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Marketable Securities: (Tables)
 12 Months Ended
Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]  
Reconciliation of 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