Interest and Other Investment Income (Loss), Net (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Dividends and interest on marketable securities	$ 3,198	$ 2,770	$ 6,304	$ 5,540
Mark-to-market of investments in our deferred compensation plan	2,380	2,492	6,780	5,938
Interest on mezzanine loans receivable	736	4,940	3,120	10,017
Income (loss) from the mark-to-market of J.C. Penney derivative position	0	9,065	0	(13,475)
Income from prepayment penalties in connection with the repayment of a mezzanine loan	0	5,267	0	5,267
Non-cash impairment loss on J.C. Penney common shares	0	0	0	(39,487)
Other, net	3,121	1,881	5,124	3,540
Interest and other investment (loss) income, net	$ 9,435	$ 26,415	$ 21,328	$ (22,660)