SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) Facility	Sep. 30, 2015 USD ($)	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	$ 946,832		$ 946,832		$ 879,686
Depreciation/Amortization	11,583	$ 9,777	33,985	$ 29,358
Capital expenditures			18,801	28,117
Net sales	138,509	140,128	412,444	419,763
Earnings before income taxes	20,771	21,189	60,135	66,440
Unallocated equity compensation	0	(1,462)	0	(1,462)
Transaction, integration costs, and legal settlement	(62)	0	(792)	0
Interest and other income (expense)	(2,175)	(1,733)	(6,112)	(5,294)
Human Nutrition & Health [Member] \| Reportable Segments [Member]
Segment information [Abstract]
Assets	719,503		719,503		642,929
Depreciation/Amortization	8,578	7,594	25,172	22,766
Capital expenditures			11,780	12,663
Net sales	74,926	72,978	221,281	207,965
Earnings before income taxes	10,460	11,604	27,856	28,397
Animal Nutrition & Health [Member] \| Reportable Segments [Member]
Segment information [Abstract]
Assets	112,551		112,551		107,459
Depreciation/Amortization	1,837	1,703	5,515	4,831
Capital expenditures			5,442	13,711
Net sales	40,935	39,947	118,579	124,295
Earnings before income taxes	6,784	5,625	20,623	21,603
Specialty Products [Member] \| Reportable Segments [Member]
Segment information [Abstract]
Assets	62,412		62,412		24,769
Depreciation/Amortization	982	288	2,777	929
Capital expenditures			1,060	750
Net sales	16,477	13,818	53,919	41,202
Earnings before income taxes	5,237	6,031	17,541	17,825
Industrial Products [Member] \| Reportable Segments [Member]
Segment information [Abstract]
Assets	8,575		8,575		16,191
Depreciation/Amortization	186	192	521	832
Capital expenditures			519	993
Net sales	6,171	13,385	18,665	46,301
Earnings before income taxes	527	$ 1,124	1,019	$ 5,371
Other Unallocated [Member] \| Reportable Segments [Member]
Segment information [Abstract]
Assets	$ 43,791		$ 43,791		$ 88,338

Value of equity interests on acquisition of one time equity compensation.

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