Mezzanine Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 30, 2021	Dec. 30, 2018	Dec. 30, 2016
Purchase Requirement [Line Items]
Terminal growth rate		2.00%
Redeemable noncontrolling interests		$ 191,633	$ 186,686
Dividend rate on preferred stock	3.25%		3.25%
Mandatorily redeemable convertible preferred shares redemption value		$ 125,000	$ 125,000
3.25% Cumulative Convertible Preferred Shares [Member]
Purchase Requirement [Line Items]
Dividend rate on preferred stock		3.25%
Mandatorily redeemable convertible preferred shares redemption value		$ 125,000
Mandatory redeemable preferred stock, number of shares in conversion		4,162,200
Mandatory redeemable preferred stock, effective conversion price per share (USD per share)		$ 30.03
Mandatorily redeemable preferred shares callable price per share		$ 1,000
Conwed Plastics [Member]
Purchase Requirement [Line Items]
Redeemable noncontrolling interests		$ 2,300	$ 2,400
Jefferies [Member]
Purchase Requirement [Line Items]
Dividend rate on preferred stock	3.25%		3.25%
Mandatorily redeemable convertible preferred shares redemption value	$ 125,000
USPB [Member] | Call Rights [Member] | Maximum [Member]
Purchase Requirement [Line Items]
Ownership interests as a percent of original interest		20.00%
Other Members [Member] | Call Rights [Member] | Maximum [Member]
Purchase Requirement [Line Items]
Ownership interests as a percent of original interest		50.00%
Anniversary of acquisition		10 years
Scenario, Forecast [Member] | National Beef [Member] | Put Rights [Member]
Purchase Requirement [Line Items]
Put right interest percentage				33.30%	33.30%	33.30%