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SEGMENT INFORMATION (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Facility
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
SEGMENT INFORMATION [Abstract]          
Percentage decrease of chlorides released in environment     75.00%    
Number of filling facilities | Facility     2    
Segment information [Abstract]          
Assets $ 954,292   $ 954,292   $ 879,686
Depreciation/Amortization 11,522 $ 9,712 22,402 $ 19,581  
Capital expenditures     14,736 15,299  
Net sales 138,794 134,773 273,935 279,635  
Earnings before income taxes 21,383 22,167 39,364 45,252  
Transaction, integration costs, and legal settlement (269) 0 (730) 0  
Interest and other income (expense) (1,950) (1,607) (3,937) (3,560)  
Human Nutrition & Health [Member] | Reportable Segments [Member]          
Segment information [Abstract]          
Assets 713,611   713,611   642,929
Depreciation/Amortization 8,513 7,533 16,594 15,172  
Capital expenditures     9,717 5,702  
Net sales 74,800 67,230 146,355 134,987  
Earnings before income taxes 9,024 9,087 17,396 16,793  
Animal Nutrition & Health [Member] | Reportable Segments [Member]          
Segment information [Abstract]          
Assets 113,682   113,682   107,459
Depreciation/Amortization 1,872 1,582 3,678 3,128  
Capital expenditures     4,151 8,290  
Net sales 38,412 41,642 77,644 84,348  
Earnings before income taxes 7,304 7,468 13,839 15,978  
Specialty Products [Member] | Reportable Segments [Member]          
Segment information [Abstract]          
Assets 76,375   76,375   24,769
Depreciation/Amortization 973 300 1,795 641  
Capital expenditures     565 489  
Net sales 20,325 13,805 37,442 27,384  
Earnings before income taxes 7,016 6,093 12,304 11,794  
Industrial Products [Member] | Reportable Segments [Member]          
Segment information [Abstract]          
Assets 8,326   8,326   16,191
Depreciation/Amortization 164 297 335 640  
Capital expenditures     303 818  
Net sales 5,257 12,096 12,494 32,916  
Earnings before income taxes 258 $ 1,126 492 $ 4,247  
Other Unallocated [Member] | Reportable Segments [Member]          
Segment information [Abstract]          
Assets $ 42,298   $ 42,298   $ 88,338