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Investment in Marketable Securities (Tables)
9 Months Ended
Sep. 30, 2012
Investment in Marketable Securities [Abstract]  
Summary of marketable securities
                                 
    Basis     Gross
Unrealized
Gain/(Loss)
    Gross
Realized
Gain/(Loss)
    Fair Value
At Quoted
Prices
in Active
Markets
(Level 1)
 

Marketable securities, December 31, 2011

  $ 64     $ 1,685     $ 0     $ 1,749