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SEGMENT INFORMATION - Business Segment Net Sales (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment information [Abstract]        
Net sales $ 202,365 $ 173,355 $ 388,021 $ 347,791
Operating segments | Human Nutrition & Health        
Segment information [Abstract]        
Net sales 111,471 97,428 215,987 192,936
Operating segments | Animal Nutrition & Health        
Segment information [Abstract]        
Net sales 54,481 46,344 105,629 94,985
Operating segments | Specialty Products        
Segment information [Abstract]        
Net sales 34,022 28,194 62,030 56,190
Other and unallocated        
Segment information [Abstract]        
Net sales $ 2,391 $ 1,389 $ 4,375 $ 3,680