Segment Information, Revenue from External Customers by Product Line (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue [Abstract]
Revenue	$ 359,702	$ 350,677
Flavors, Extracts & Flavor Ingredients [Member]
Revenue [Abstract]
Revenue	108,090	101,453
Natural Ingredients [Member]
Revenue [Abstract]
Revenue	62,204	57,600
Fragrances [Member]
Revenue [Abstract]
Revenue	28,467	22,284
Yogurt Fruit Preparations [Member]
Revenue [Abstract]
Revenue	2,150	5,161
Food & Pharmaceutical Colors [Member]
Revenue [Abstract]
Revenue	93,785	90,793
Personal Care [Member]
Revenue [Abstract]
Revenue	41,515	43,743
Inks [Member]
Revenue [Abstract]
Revenue	420	8,959
Asia Pacific [Member]
Revenue [Abstract]
Revenue	33,840	30,449
Flavors & Extracts [Member]
Revenue [Abstract]
Revenue	194,661	181,187
Flavors & Extracts [Member] | Flavors, Extracts & Flavor Ingredients [Member]
Revenue [Abstract]
Revenue	108,090	101,453
Flavors & Extracts [Member] | Natural Ingredients [Member]
Revenue [Abstract]
Revenue	62,204	57,600
Flavors & Extracts [Member] | Fragrances [Member]
Revenue [Abstract]
Revenue	28,467	22,284
Flavors & Extracts [Member] | Yogurt Fruit Preparations [Member]
Revenue [Abstract]
Revenue	2,150	5,161
Color [Member]
Revenue [Abstract]
Revenue	131,201	139,193
Color [Member] | Food & Pharmaceutical Colors [Member]
Revenue [Abstract]
Revenue	93,785	90,793
Color [Member] | Personal Care [Member]
Revenue [Abstract]
Revenue	41,515	43,743
Color [Member] | Inks [Member]
Revenue [Abstract]
Revenue	420	8,959
Asia Pacific [Member]
Revenue [Abstract]
Revenue	33,840	30,297
Asia Pacific [Member] | Asia Pacific [Member]
Revenue [Abstract]
Revenue	33,840	30,449
Intersegment Revenue [Member]
Revenue [Abstract]
Revenue	10,769	9,765
Intersegment Revenue [Member] | Flavors & Extracts [Member]
Revenue [Abstract]
Revenue	6,250	5,311
Intersegment Revenue [Member] | Color [Member]
Revenue [Abstract]
Revenue	4,519	4,302
Intersegment Revenue [Member] | Asia Pacific [Member]
Revenue [Abstract]
Revenue	$ 0	$ 152