Mezzanine Equity (Schedule Of Redeemable Noncontrolling Interests) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Redeemable Noncontrolling Interest [Roll Forward]
As of January 1,	$ 191,633
Income (loss) allocated to redeemable noncontrolling interests	4,314	$ (7,112)
Increase (decrease) in fair value of redeemable noncontrolling interests credited to additional paid-in capital	(12,835)	11,033
Balance, March 31,	208,773
National Beef [Member]
Redeemable Noncontrolling Interest [Roll Forward]
As of January 1,	189,358	184,333
Income (loss) allocated to redeemable noncontrolling interests	4,384	(7,059)
Increase (decrease) in fair value of redeemable noncontrolling interests credited to additional paid-in capital	12,835	(11,033)
Balance, March 31,	$ 206,577	$ 166,241