Segment and Geographic Information, Revenue from External Customers by Products Line (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue [Abstract]
Revenue	$ 1,332,001	$ 1,322,934	$ 1,386,815
Flavors, Extracts & Flavor Ingredients [Member]
Revenue [Abstract]
Revenue	399,331	378,967	403,762
Natural Ingredients [Member]
Revenue [Abstract]
Revenue	243,161	214,027	224,280
Fragrances [Member]
Revenue [Abstract]
Revenue	85,354	86,399	91,786
Yogurt Fruit Preparations [Member]
Revenue [Abstract]
Revenue	14,189	20,963	27,104
Food & Pharmaceutical Colors [Member]
Revenue [Abstract]
Revenue	346,269	340,327	332,878
Personal Care [Member]
Revenue [Abstract]
Revenue	141,331	159,640	179,485
Inks [Member]
Revenue [Abstract]
Revenue	13,418	35,192	41,641
Asia Pacific [Member]
Revenue [Abstract]
Revenue	121,227	118,248	123,164
Flavors & Extracts [Member]
Revenue [Abstract]
Revenue	724,483	682,705	723,189
Flavors & Extracts [Member] | Flavors, Extracts & Flavor Ingredients [Member]
Revenue [Abstract]
Revenue	399,331	378,967	403,762
Flavors & Extracts [Member] | Natural Ingredients [Member]
Revenue [Abstract]
Revenue	243,161	214,027	224,280
Flavors & Extracts [Member] | Fragrances [Member]
Revenue [Abstract]
Revenue	85,354	86,399	91,786
Flavors & Extracts [Member] | Yogurt Fruit Preparations [Member]
Revenue [Abstract]
Revenue	14,189	20,963	27,104
Color [Member]
Revenue [Abstract]
Revenue	486,536	522,051	540,499
Color [Member] | Food & Pharmaceutical Colors [Member]
Revenue [Abstract]
Revenue	346,269	340,327	332,878
Color [Member] | Personal Care [Member]
Revenue [Abstract]
Revenue	141,331	159,640	179,485
Color [Member] | Inks [Member]
Revenue [Abstract]
Revenue	13,418	35,192	41,641
Asia Pacific [Member]
Revenue [Abstract]
Revenue	120,982	118,178	123,127
Asia Pacific [Member] | Asia Pacific [Member]
Revenue [Abstract]
Revenue	121,227	118,248	123,164
Intersegment Revenue [Member]
Revenue [Abstract]
Revenue	32,279	30,829	37,285
Intersegment Revenue [Member] | Flavors & Extracts [Member]
Revenue [Abstract]
Revenue	17,552	17,651	23,743
Intersegment Revenue [Member] | Color [Member]
Revenue [Abstract]
Revenue	14,482	13,108	13,505
Intersegment Revenue [Member] | Asia Pacific [Member]
Revenue [Abstract]
Revenue	$ 245	$ 70	$ 37