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Intangible Assets, Net and Goodwill (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jun. 05, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]            
Amortization expense on intangible assets $ 3,300 $ 3,200 $ 9,900 $ 9,700    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Intangible assets 191,770   191,770     $ 741,030
Goodwill $ 1,703,128   $ 1,703,128     1,722,150
National Beef | Discontinued operations, disposed of by sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Percentage of ownership owned         48.00%  
Intangible assets           539,600
Goodwill           $ 15,000