Marketable Securities and Derivative Instruments (Tables)

12 Months Ended

Dec. 31, 2011

Unrealized Gain (Loss) on Investments [Abstract]

Unrealized Gain (Loss) on Investments [Table Text Block]

	Below is a summary of our marketable securities portfolio as of December 31, 2011 and 2010.
		As of December 31, 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	$	653,228	$	591,069	$	62,159	n/a	$	601,303	$	591,069	$	10,234
	Other	n/a		29,544		13,561		15,983	n/a		46,545		25,778		20,767
Debt securities		04/13 - 10/18		58,549		54,965		3,584	08/11 - 10/18		118,268		104,180		14,088
			$	741,321	$	659,595	$	81,726		$	766,116	$	721,027	$	45,089