Interest and Other Investment Income (Loss), Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest and Other Investment Income (Loss), Net [Abstract]
Dividends on marketable securities	$ 12,836	$ 12,707	$ 11,446
Interest on loans receivable	6,371	6,107	20,683
Mark-to-market of investments in our deferred compensation plan	111	11,557	10,636
Losses from the disposition of investment in J.C. Penney	0	0	(72,974)
Other, net	7,660	8,381	5,322
Interest and other investment (loss) income, net	$ 26,978	$ 38,752	$ (24,887)