Interest and Other Investment Income (Loss), Net (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Mark-to-market of investments in our deferred compensation plan	$ 4,400	$ 3,446
Dividends and interest on marketable securities	3,106	2,770
Interest on mezzanine loans receivable	2,384	5,077
Non-cash impairment loss on J.C. Penney common shares	0	(39,487)
Loss from the mark-to-market of J.C. Penney derivative position	0	(22,540)
Other, net	2,003	1,659
Interest and other investment (loss) income, net	$ 11,893	$ (49,075)