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Marketable Securities and Derivative Instruments (Tables)
6 Months Ended
Jun. 30, 2011
Marketable Securities and Derivative Instruments Tables [Abstract]  
Schedule of Marketable Securities and Derivative Instruments
   As of June 30, 2011 As of December 31, 2010
        GAAP Unrealized      GAAP Unrealized
   Maturity Fair Value Cost Gain Maturity Fair Value Cost Gain
Equity securities:                      
 J.C. Penney n/a $ 641,892 $ 590,366 $ 51,526 n/a $ 600,449 $ 590,215 $ 10,234
 Other n/a   35,413   13,561   21,852 n/a   47,399   26,632   20,767
Debt securities 04/13 - 10/18   114,371   101,816   12,555 08/11 - 10/18   118,268   104,180   14,088
     $ 791,676 $ 705,743 $ 85,933   $ 766,116 $ 721,027 $ 45,089