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SEGMENT INFORMATION - Business Segment Earnings Before Income Tax (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]                      
Earnings before income taxes $ 25,263 $ 23,529 $ 25,061 $ 25,177 $ 24,522 $ 20,697 $ 22,560 $ 20,710 $ 99,030 $ 88,488 $ 82,934
Segment Reconciling Items                      
Segment Reporting Information [Line Items]                      
Transaction and integration costs                 (1,786) (2,496) (815)
Indemnification settlement                 0 2,087 0
Interest and other income, net                 (8,721) (8,767) (7,904)
Human Nutrition & Health | Operating Segments                      
Segment Reporting Information [Line Items]                      
Earnings before income taxes                 48,490 44,010 38,156
Animal Nutrition & Health | Operating Segments                      
Segment Reporting Information [Line Items]                      
Earnings before income taxes                 26,673 22,292 28,686
Specialty Products | Operating Segments                      
Segment Reporting Information [Line Items]                      
Earnings before income taxes                 25,361 24,949 22,862
Industrial Products | Operating Segments                      
Segment Reporting Information [Line Items]                      
Earnings before income taxes                 $ 9,013 $ 6,413 $ 1,949