Segment Information, Revenue from External Customers by Product Line (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue [Abstract]
Revenue	$ 323,566	$ 317,650	$ 997,333	$ 1,004,349
Flavors, Extracts & Flavor Ingredients [Member]
Revenue [Abstract]
Revenue	98,952	88,404	302,047	292,347
Natural Ingredients [Member]
Revenue [Abstract]
Revenue	60,937	53,220	175,764	156,864
Fragrances [Member]
Revenue [Abstract]
Revenue	19,890	21,395	63,251	65,828
Yogurt Fruit Preparations [Member]
Revenue [Abstract]
Revenue	3,087	4,558	11,913	16,225
Food & Pharmaceutical Colors [Member]
Revenue [Abstract]
Revenue	83,406	81,805	261,024	259,249
Personal Care [Member]
Revenue [Abstract]
Revenue	32,495	37,276	107,333	123,595
Inks [Member]
Revenue [Abstract]
Revenue	513	7,924	12,848	26,952
Asia Pacific [Member]
Revenue [Abstract]
Revenue	30,740	30,125	89,062	87,646
Flavors & Extracts [Member]
Revenue [Abstract]
Revenue	179,687	163,870	539,304	517,148
Flavors & Extracts [Member] | Flavors, Extracts & Flavor Ingredients [Member]
Revenue [Abstract]
Revenue	98,952	88,404	302,047	292,347
Flavors & Extracts [Member] | Natural Ingredients [Member]
Revenue [Abstract]
Revenue	60,937	53,220	175,764	156,864
Flavors & Extracts [Member] | Fragrances [Member]
Revenue [Abstract]
Revenue	19,890	21,395	63,251	65,828
Flavors & Extracts [Member] | Yogurt Fruit Preparations [Member]
Revenue [Abstract]
Revenue	3,087	4,558	11,913	16,225
Color [Member]
Revenue [Abstract]
Revenue	113,139	123,710	369,211	399,610
Color [Member] | Food & Pharmaceutical Colors [Member]
Revenue [Abstract]
Revenue	83,406	81,805	261,024	259,249
Color [Member] | Personal Care [Member]
Revenue [Abstract]
Revenue	32,495	37,276	107,333	123,595
Color [Member] | Inks [Member]
Revenue [Abstract]
Revenue	513	7,924	12,848	26,952
Asia Pacific [Member]
Revenue [Abstract]
Revenue	30,740	30,070	88,818	87,591
Asia Pacific [Member] | Asia Pacific [Member]
Revenue [Abstract]
Revenue	30,740	30,125	89,062	87,646
Intersegment Revenue [Member]
Revenue [Abstract]
Revenue	6,454	7,057	25,909	24,357
Intersegment Revenue [Member] | Flavors & Extracts [Member]
Revenue [Abstract]
Revenue	3,179	3,707	13,671	14,116
Intersegment Revenue [Member] | Color [Member]
Revenue [Abstract]
Revenue	3,275	3,295	11,994	10,186
Intersegment Revenue [Member] | Asia Pacific [Member]
Revenue [Abstract]
Revenue	$ 0	$ 55	$ 244	$ 55