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Goodwill
9 Months Ended
Sep. 26, 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 translation3,749 9,229 3,074 16,052 
Balance at September 26, 2020   
Goodwill797,206 338,883 119,629 1,255,718 
Accumulated impairment losses(15,914)(461)— (16,375)
 $781,292 $338,422 $119,629 $1,239,343