Segment and Geographic Information, Revenue from External Customers by Products Line (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue [Abstract]
Revenue	$ 1,386,815	$ 1,362,265	$ 1,383,210
Flavors & Fragrances [Member]
Revenue [Abstract]
Revenue	723,189	727,026	771,434
Flavors [Member]
Revenue [Abstract]
Revenue	414,728	439,811	474,904
Natural Ingredients [Member]
Revenue [Abstract]
Revenue	224,280	219,837	237,664
Fragrances [Member]
Revenue [Abstract]
Revenue	107,924	87,295	83,243
Color [Member]
Revenue [Abstract]
Revenue	539,974	512,811	490,862
Food & Beverage Colors [Member]
Revenue [Abstract]
Revenue	303,386	279,870	279,516
Cosmetics [Member]
Revenue [Abstract]
Revenue	153,347	147,637	123,937
Other Colors [Member]
Revenue [Abstract]
Revenue	96,746	98,856	100,678
Asia Pacific [Member]
Revenue [Abstract]
Revenue	123,127	122,428	120,914
Intersegment Revenue [Member]
Revenue [Abstract]
Revenue	(37,285)	(34,234)	(37,928)
Intersegment Revenue [Member] | Flavors & Fragrances [Member]
Revenue [Abstract]
Revenue	(23,743)	(19,917)	(24,377)
Intersegment Revenue [Member] | Color [Member]
Revenue [Abstract]
Revenue	(13,505)	(13,552)	(13,269)
Intersegment Revenue [Member] | Asia Pacific [Member]
Revenue [Abstract]
Revenue	(37)	(765)	(282)
Corporate & Other [Member]
Revenue [Abstract]
Revenue	$ 525	$ 0	$ 0