Segment Information, Operating Results by Segment (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) Segment	Sep. 30, 2020 USD ($)
Segment Information [Abstract]
Number of reportable segments | Segment			3
Revenue [Abstract]
Revenue	$ 344,287	$ 323,566	$ 1,039,816	$ 997,333
Operating income (loss)	46,958	41,155	129,608	117,841
Interest expense	3,037	3,497	9,792	11,412
Earnings before income taxes	43,921	37,658	119,816	106,429
Flavors & Extracts [Member]
Revenue [Abstract]
Revenue	175,690	179,687	545,050	539,304
Operating income (loss)	25,164	23,844	76,718	67,467
Interest expense	0	0	0	0
Earnings before income taxes	25,164	23,844	76,718	67,467
Color [Member]
Revenue [Abstract]
Revenue	135,395	113,139	395,426	369,211
Operating income (loss)	27,253	23,559	79,462	75,486
Interest expense	0	0	0	0
Earnings before income taxes	27,253	23,559	79,462	75,486
Asia Pacific [Member]
Revenue [Abstract]
Revenue	33,202	30,740	99,340	88,818
Operating income (loss)	6,601	6,123	19,146	16,031
Interest expense	0	0	0	0
Earnings before income taxes	6,601	6,123	19,146	16,031
Reportable Segments [Member]
Revenue [Abstract]
Revenue	354,348	330,020	1,069,744	1,023,242
Reportable Segments [Member] | Flavors & Extracts [Member]
Revenue [Abstract]
Revenue	181,667	182,866	561,979	552,975
Reportable Segments [Member] | Color [Member]
Revenue [Abstract]
Revenue	139,239	116,414	408,166	381,205
Reportable Segments [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
Corporate & Other [Member]
Revenue [Abstract]
Revenue	0	0	0	0
Operating income (loss)	(12,060)	(12,371)	(45,718)	(41,143)
Interest expense	3,037	3,497	9,792	11,412
Earnings before income taxes	$ (15,097)	$ (15,868)	$ (55,510)	$ (52,555)