Segment Information (Schedule Of Segment Reporting Information, By Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment Reporting Information [Line Items]
Net Revenues	$ 2,705,150	$ 1,746,041	$ 5,031,905	$ 4,505,218
Income (loss) from continuing operations before income taxes and income related to associated companies	45,448	(287,700)	363,417	442,608
Depreciation and amortization expenses	50,400	38,678	83,175	75,753
Beef Processing Services [Member]
Segment Reporting Information [Line Items]
Net Revenues	1,920,423	1,913,666	3,709,865	3,705,645
Income (loss) from continuing operations before income taxes and income related to associated companies	27,286	46,937	6,772	29,340
Depreciation and amortization expenses	21,855	20,757	43,588	41,065
Investment Banking & Capital Markets [Member]
Segment Reporting Information [Line Items]
Net Revenues	651,509		651,509
Income (loss) from continuing operations before income taxes and income related to associated companies	77,603		77,603
Depreciation and amortization expenses	18,934		18,934
Domestic Real Estate [Member]
Segment Reporting Information [Line Items]
Net Revenues	3,673	3,409	8,015	6,830
Income (loss) from continuing operations before income taxes and income related to associated companies	(591)	(2,073)	(471)	(3,182)
Depreciation and amortization expenses	877	868	1,769	1,743
Medical Product Development [Member]
Segment Reporting Information [Line Items]
Net Revenues	119	125	220	199
Income (loss) from continuing operations before income taxes and income related to associated companies	(8,633)	(11,252)	(18,043)	(21,305)
Depreciation and amortization expenses	213	213	435	423
Other Operations [Member]
Segment Reporting Information [Line Items]
Net Revenues	111,015	110,898	225,400	223,663
Income (loss) from continuing operations before income taxes and income related to associated companies	(16,389)	(583)	(17,557)	6,394
Depreciation and amortization expenses	5,527	9,686	12,279	19,386
Corporate [Member]
Segment Reporting Information [Line Items]
Net Revenues	18,411	(282,057)	436,896	568,881
Income (loss) from continuing operations before income taxes and income related to associated companies	(33,828)	(320,729)	315,113	431,361
Depreciation and amortization expenses	$ 2,994	$ 7,154	$ 6,170	$ 13,136