Loans To And Investments In Associated Companies (Schedule Of Income (Losses) Related To Associated Companies) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Investments In Associated Companies [Line Items]
Income (losses) related to associated companies before income taxes	$ 34,863,000	$ 13,536,000	$ 65,671,000	$ 41,528,000
Berkadia [Member]
Investments In Associated Companies [Line Items]
Income (losses) related to associated companies before income taxes	30,844,000	2,410,000	49,431,000	14,230,000
Prior period income adjustment	14,800,000
Garcadia [Member]
Investments In Associated Companies [Line Items]
Income (losses) related to associated companies before income taxes	11,244,000	8,888,000	20,115,000	16,982,000
HomeFed Corporation [Member]
Investments In Associated Companies [Line Items]
Income (losses) related to associated companies before income taxes	(355,000)	(447,000)	(596,000)	(562,000)
Brooklyn Renaissance Plaza [Member]
Investments In Associated Companies [Line Items]
Income (losses) related to associated companies before income taxes	203,000	1,540,000	995,000	1,981,000
Linkem
Investments In Associated Companies [Line Items]
Income (losses) related to associated companies before income taxes	(6,920,000)	(4,078,000)	(13,522,000)	(8,268,000)
JHYH [Member]
Investments In Associated Companies [Line Items]
Income (losses) related to associated companies before income taxes		4,579,000	7,178,000	14,273,000
Other [Member]
Investments In Associated Companies [Line Items]
Income (losses) related to associated companies before income taxes	$ (153,000)	$ 644,000	$ 2,070,000	$ 2,892,000