Segment Information, Revenue from External Customers by Product Line (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Revenue [Abstract]
Revenue from external customers	$ 435,834	$ 392,325
Flavors, Extracts & Flavor Ingredients [Member]
Revenue [Abstract]
Revenue from external customers	138,564	130,181
Agricultural Ingredients [Member]
Revenue [Abstract]
Revenue from external customers	63,261	63,500
Food & Pharmaceutical Colors [Member]
Revenue [Abstract]
Revenue from external customers	151,280	124,600
Personal Care [Member]
Revenue [Abstract]
Revenue from external customers	46,896	43,150
Flavors & Extracts [Member]
Revenue [Abstract]
Revenue from external customers	196,106	187,798
Flavors & Extracts [Member] \| Flavors, Extracts & Flavor Ingredients [Member]
Revenue [Abstract]
Revenue from external customers	138,564	130,181
Flavors & Extracts [Member] \| Agricultural Ingredients [Member]
Revenue [Abstract]
Revenue from external customers	63,261	63,500
Flavors & Extracts [Member] \| Food & Pharmaceutical Colors [Member]
Revenue [Abstract]
Revenue from external customers	0	0
Flavors & Extracts [Member] \| Personal Care [Member]
Revenue [Abstract]
Revenue from external customers	0	0
Color [Member]
Revenue [Abstract]
Revenue from external customers	194,522	162,636
Color [Member] \| Flavors, Extracts & Flavor Ingredients [Member]
Revenue [Abstract]
Revenue from external customers	0	0
Color [Member] \| Agricultural Ingredients [Member]
Revenue [Abstract]
Revenue from external customers	0	0
Color [Member] \| Food & Pharmaceutical Colors [Member]
Revenue [Abstract]
Revenue from external customers	151,280	124,600
Color [Member] \| Personal Care [Member]
Revenue [Abstract]
Revenue from external customers	46,896	43,150
Asia Pacific [Member]
Revenue [Abstract]
Revenue from external customers	45,206	41,891
Asia Pacific [Member] \| Flavors, Extracts & Flavor Ingredients [Member]
Revenue [Abstract]
Revenue from external customers	0	0
Asia Pacific [Member] \| Agricultural Ingredients [Member]
Revenue [Abstract]
Revenue from external customers	0	0
Asia Pacific [Member] \| Food & Pharmaceutical Colors [Member]
Revenue [Abstract]
Revenue from external customers	0	0
Asia Pacific [Member] \| Personal Care [Member]
Revenue [Abstract]
Revenue from external customers	0	0
Reportable Segments [Member]
Revenue [Abstract]
Revenue from external customers	445,256	403,332
Reportable Segments [Member] \| Flavors & Extracts [Member]
Revenue [Abstract]
Revenue from external customers	201,825	193,681
Reportable Segments [Member] \| Color [Member]
Revenue [Abstract]
Revenue from external customers	198,176	167,750
Reportable Segments [Member] \| Asia Pacific [Member]
Revenue [Abstract]
Revenue from external customers	45,255	41,901
Intersegment Revenue [Member]
Revenue [Abstract]
Revenue from external customers	(9,422)	(11,007)
Intersegment Revenue [Member] \| Flavors & Extracts [Member]
Revenue [Abstract]
Revenue from external customers	(5,719)	(5,883)
Intersegment Revenue [Member] \| Color [Member]
Revenue [Abstract]
Revenue from external customers	(3,654)	(5,114)
Intersegment Revenue [Member] \| Asia Pacific [Member]
Revenue [Abstract]
Revenue from external customers	$ (49)	$ (10)