Segment Information, Revenue from External Customers by Product Line (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue [Abstract]
Revenue	$ 344,287	$ 323,566	$ 1,039,816	$ 997,333
Flavors, Extracts & Flavor Ingredients [Member]
Revenue [Abstract]
Revenue	116,140	98,952	347,642	302,047
Natural Ingredients [Member]
Revenue [Abstract]
Revenue	64,215	60,937	186,721	175,764
Fragrances [Member]
Revenue [Abstract]
Revenue		19,890	22,739	63,251
Yogurt Fruit Preparations [Member]
Revenue [Abstract]
Revenue	1,312	3,087	4,877	11,913
Food & Pharmaceutical Colors [Member]
Revenue [Abstract]
Revenue	99,688	83,406	287,565	261,024
Personal Care [Member]
Revenue [Abstract]
Revenue	39,241	32,495	119,079	107,333
Inks [Member]
Revenue [Abstract]
Revenue	310	513	1,522	12,848
Asia Pacific [Member]
Revenue [Abstract]
Revenue	33,442	30,740	99,599	89,062
Flavors & Extracts [Member]
Revenue [Abstract]
Revenue	175,690	179,687	545,050	539,304
Flavors & Extracts [Member] | Flavors, Extracts & Flavor Ingredients [Member]
Revenue [Abstract]
Revenue	116,140	98,952	347,642	302,047
Flavors & Extracts [Member] | Natural Ingredients [Member]
Revenue [Abstract]
Revenue	64,215	60,937	186,721	175,764
Flavors & Extracts [Member] | Fragrances [Member]
Revenue [Abstract]
Revenue		19,890	22,739	63,251
Flavors & Extracts [Member] | Yogurt Fruit Preparations [Member]
Revenue [Abstract]
Revenue	1,312	3,087	4,877	11,913
Color [Member]
Revenue [Abstract]
Revenue	135,395	113,139	395,426	369,211
Color [Member] | Food & Pharmaceutical Colors [Member]
Revenue [Abstract]
Revenue	99,688	83,406	287,565	261,024
Color [Member] | Personal Care [Member]
Revenue [Abstract]
Revenue	39,241	32,495	119,079	107,333
Color [Member] | Inks [Member]
Revenue [Abstract]
Revenue	310	513	1,522	12,848
Asia Pacific [Member]
Revenue [Abstract]
Revenue	33,202	30,740	99,340	88,818
Asia Pacific [Member] | Asia Pacific [Member]
Revenue [Abstract]
Revenue	33,442	30,740	99,599	89,062
Intersegment Revenue [Member]
Revenue [Abstract]
Revenue	10,061	6,454	29,928	25,909
Intersegment Revenue [Member] | Flavors & Extracts [Member]
Revenue [Abstract]
Revenue	5,977	3,179	16,929	13,671
Intersegment Revenue [Member] | Color [Member]
Revenue [Abstract]
Revenue	3,844	3,275	12,740	11,994
Intersegment Revenue [Member] | Asia Pacific [Member]
Revenue [Abstract]
Revenue	$ 240	$ 0	$ 259	$ 244