Segment and Geographic Information, Revenue from External Customers by Products Line (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue [Abstract]
Revenue	$ 1,322,934	$ 1,386,815	$ 1,362,265
Flavors [Member]
Revenue [Abstract]
Revenue	382,447	414,728	439,811
Natural Ingredients [Member]
Revenue [Abstract]
Revenue	214,027	224,280	219,837
Fragrances [Member]
Revenue [Abstract]
Revenue	103,882	107,924	87,295
Food & Beverage Colors [Member]
Revenue [Abstract]
Revenue	306,274	303,386	279,870
Cosmetics [Member]
Revenue [Abstract]
Revenue	137,043	153,347	147,637
Other Colors [Member]
Revenue [Abstract]
Revenue	91,842	97,271	98,856
Flavors & Fragrances [Member]
Revenue [Abstract]
Revenue	682,705	723,189	727,026
Color [Member]
Revenue [Abstract]
Revenue	522,051	540,499	512,811
Asia Pacific [Member]
Revenue [Abstract]
Revenue	118,178	123,127	122,428
Asia Pacific [Member] | Asia Pacific [Member]
Revenue [Abstract]
Revenue	118,248	123,164	123,193
Intersegment Revenue [Member]
Revenue [Abstract]
Revenue	(30,829)	(37,285)	(34,234)
Intersegment Revenue [Member] | Flavors & Fragrances [Member]
Revenue [Abstract]
Revenue	(17,651)	(23,743)	(19,917)
Intersegment Revenue [Member] | Color [Member]
Revenue [Abstract]
Revenue	(13,108)	(13,505)	(13,552)
Intersegment Revenue [Member] | Asia Pacific [Member]
Revenue [Abstract]
Revenue	$ (70)	$ (37)	$ (765)