Segment Information, Revenue from External Customers by Product Line (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenue [Abstract]
Revenue	$ 363,829	$ 361,076	$ 1,107,148	$ 1,088,303
Flavors, Extracts & Flavor Ingredients [Member]
Revenue [Abstract]
Revenue	124,697	123,945	383,210	381,041
Natural Ingredients [Member]
Revenue [Abstract]
Revenue	66,300	63,101	174,923	178,069
Food & Pharmaceutical Colors [Member]
Revenue [Abstract]
Revenue	107,723	111,194	346,635	328,087
Personal Care [Member]
Revenue [Abstract]
Revenue	37,216	39,689	119,928	126,651
Inks [Member]
Revenue [Abstract]
Revenue		586		1,437
Flavors & Extracts [Member]
Revenue [Abstract]
Revenue	185,029	181,397	538,753	539,014
Flavors & Extracts [Member] | Flavors, Extracts & Flavor Ingredients [Member]
Revenue [Abstract]
Revenue	124,697	123,945	383,210	381,041
Flavors & Extracts [Member] | Natural Ingredients [Member]
Revenue [Abstract]
Revenue	66,300	63,101	174,923	178,069
Flavors & Extracts [Member] | Food & Pharmaceutical Colors [Member]
Revenue [Abstract]
Revenue	0	0	0	0
Flavors & Extracts [Member] | Personal Care [Member]
Revenue [Abstract]
Revenue	0	0	0	0
Flavors & Extracts [Member] | Inks [Member]
Revenue [Abstract]
Revenue		0		0
Color [Member]
Revenue [Abstract]
Revenue	142,026	144,570	455,507	440,568
Color [Member] | Flavors, Extracts & Flavor Ingredients [Member]
Revenue [Abstract]
Revenue	0	0	0	0
Color [Member] | Natural Ingredients [Member]
Revenue [Abstract]
Revenue	0	0	0	0
Color [Member] | Food & Pharmaceutical Colors [Member]
Revenue [Abstract]
Revenue	107,723	111,194	346,635	328,087
Color [Member] | Personal Care [Member]
Revenue [Abstract]
Revenue	37,216	39,689	119,928	126,651
Color [Member] | Inks [Member]
Revenue [Abstract]
Revenue		586		1,437
Asia Pacific [Member]
Revenue [Abstract]
Revenue	36,774	35,109	112,888	108,721
Asia Pacific [Member] | Flavors, Extracts & Flavor Ingredients [Member]
Revenue [Abstract]
Revenue	0	0	0	0
Asia Pacific [Member] | Natural Ingredients [Member]
Revenue [Abstract]
Revenue	0	0	0	0
Asia Pacific [Member] | Food & Pharmaceutical Colors [Member]
Revenue [Abstract]
Revenue	0	0	0	0
Asia Pacific [Member] | Personal Care [Member]
Revenue [Abstract]
Revenue	0	0	0	0
Asia Pacific [Member] | Inks [Member]
Revenue [Abstract]
Revenue		0		0
Reportable Segments [Member]
Revenue [Abstract]
Revenue	372,710	373,736	1,137,584	1,124,299
Reportable Segments [Member] | Flavors & Extracts [Member]
Revenue [Abstract]
Revenue	190,997	187,046	558,133	559,110
Reportable Segments [Member] | Color [Member]
Revenue [Abstract]
Revenue	144,939	151,469	466,563	456,175
Reportable Segments [Member] | Asia Pacific [Member]
Revenue [Abstract]
Revenue	36,774	35,221	112,888	109,014
Intersegment Revenue [Member]
Revenue [Abstract]
Revenue	8,881	12,660	30,436	35,996
Intersegment Revenue [Member] | Flavors & Extracts [Member]
Revenue [Abstract]
Revenue	5,968	5,649	19,380	20,096
Intersegment Revenue [Member] | Color [Member]
Revenue [Abstract]
Revenue	2,913	6,899	11,056	15,607
Intersegment Revenue [Member] | Asia Pacific [Member]
Revenue [Abstract]
Revenue	$ 0	$ 112	$ 0	$ 293