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Goodwill
6 Months Ended
Jun. 27, 2020
Intangible Asset Disclosure Text Block [Abstract]  
Goodwill GoodwillChanges in the carrying amount of goodwill (in thousands):
 Feed IngredientsFood IngredientsFuel IngredientsTotal
Balance at December 28, 2019   
Goodwill$793,457  $329,654  $116,555  $1,239,666  
Accumulated impairment losses(15,914) (461) —  (16,375) 
 777,543  329,193  116,555  1,223,291  
Foreign currency translation(6,458) 1,132  (788) (6,114) 
Balance at June 27, 2020   
Goodwill786,999  330,786  115,767  1,233,552  
Accumulated impairment losses(15,914) (461) —  (16,375) 
 $771,085  $330,325  $115,767  $1,217,177