Marketable Securities and Derivative Instruments (Tables)

9 Months Ended

Sep. 30, 2011

Marketable Securities and Derivative Instruments Tables [Abstract]

Schedule of Marketable Securities and Derivative Instruments

		As of September 30, 2011							As of December 31, 2010
					GAAP		Unrealized					GAAP		Unrealized
		Maturity	Fair Value		Cost		(Loss) Gain		Maturity	Fair Value		Cost		Gain
Equity securities:
	J.C. Penney	n/a	$	497,680	$	590,366	$	(92,686)	n/a	$	600,600	$	590,366	$	10,234
	Other	n/a		26,769		13,561		13,208	n/a		47,248		26,481		20,767
Debt securities		04/13 - 10/18		106,912		102,679		4,233	08/11 - 10/18		118,268		104,180		14,088
			$	631,361	$	706,606	$	(75,245)		$	766,116	$	721,027	$	45,089