Mezzanine Equity (Schedule Of Redeemable Noncontrolling Interests) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Redeemable Noncontrolling Interest [Roll Forward]
Beginning Balance	$ 336,809
Income allocated to redeemable noncontrolling interests	12,022	$ 4,314
Distributions to redeemable noncontrolling interests	185	0
Increase in fair value of redeemable noncontrolling interests	(1,038)	(12,835)
Ending Balance	342,574
National Beef [Member]
Redeemable Noncontrolling Interest [Roll Forward]
Beginning Balance	321,962	189,358
Income allocated to redeemable noncontrolling interests	12,049	4,384
Distributions to redeemable noncontrolling interests	7,117	0
Increase in fair value of redeemable noncontrolling interests	1,038	12,835
Ending Balance	$ 327,932	$ 206,577