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SEGMENT INFORMATION (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Facility
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
SEGMENT INFORMATION [Abstract]          
Number of filling facilities | Facility     2    
Percentage decrease of chlorides released in environment     75.00%    
Segment information [Abstract]          
Assets $ 958,838   $ 958,838   $ 948,626
Depreciation/Amortization 10,973 $ 11,583 32,810 $ 33,985  
Capital expenditures     17,676 18,801  
Net sales 150,716 138,509 435,526 412,444  
Earnings before income taxes 20,697 20,771 63,966 60,135  
Transaction, integration costs, and legal settlement (228) (62) (2,181) (792)  
Indemnification settlement 0 0 2,087 0  
Interest and other income (expense) (2,358) (2,175) (6,623) (6,112)  
Human Nutrition & Health [Member] | Reportable Segments [Member]          
Segment information [Abstract]          
Assets 719,880   719,880   709,337
Depreciation/Amortization 8,462 8,578 24,773 25,172  
Capital expenditures     13,290 11,780  
Net sales 81,365 74,926 232,523 221,281  
Earnings before income taxes 10,426 10,460 31,942 27,856  
Animal Nutrition & Health [Member] | Reportable Segments [Member]          
Segment information [Abstract]          
Assets 115,942   115,942   121,860
Depreciation/Amortization 1,296 1,837 4,330 5,515  
Capital expenditures     2,585 5,442  
Net sales 38,010 40,935 113,136 118,579  
Earnings before income taxes 5,154 6,784 14,219 20,623  
Specialty Products [Member] | Reportable Segments [Member]          
Segment information [Abstract]          
Assets 63,178   63,178   64,030
Depreciation/Amortization 1,028 982 3,067 2,777  
Capital expenditures     852 1,060  
Net sales 17,264 16,477 56,813 53,919  
Earnings before income taxes 5,607 5,237 20,125 17,541  
Industrial Products [Member] | Reportable Segments [Member]          
Segment information [Abstract]          
Assets 14,749   14,749   10,477
Depreciation/Amortization 187 186 640 521  
Capital expenditures     949 519  
Net sales 14,077 6,171 33,054 18,665  
Earnings before income taxes 2,096 $ 527 4,397 $ 1,019  
Other Unallocated [Member]          
Segment information [Abstract]          
Assets $ 45,089   $ 45,089   $ 42,922