Segment Information, Revenue from External Customers by Geographic Markets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue [Abstract]
Revenue	$ 350,677	$ 347,513
North America [Member]
Revenue [Abstract]
Revenue	182,966	178,779
Europe [Member]
Revenue [Abstract]
Revenue	82,637	90,177
Asia Pacific [Member]
Revenue [Abstract]
Revenue	54,452	52,300
Other [Member]
Revenue [Abstract]
Revenue	30,622	26,257
Flavors & Fragrances [Member]
Revenue [Abstract]
Revenue	181,187	178,744
Color [Member]
Revenue [Abstract]
Revenue	139,193	140,250
Asia Pacific [Member]
Revenue [Abstract]
Revenue	30,297	28,519
Reportable Geographical Components [Member] | Flavors & Fragrances [Member] | North America [Member]
Revenue [Abstract]
Revenue	116,701	112,747
Reportable Geographical Components [Member] | Flavors & Fragrances [Member] | Europe [Member]
Revenue [Abstract]
Revenue	43,877	48,001
Reportable Geographical Components [Member] | Flavors & Fragrances [Member] | Asia Pacific [Member]
Revenue [Abstract]
Revenue	9,355	7,609
Reportable Geographical Components [Member] | Flavors & Fragrances [Member] | Other [Member]
Revenue [Abstract]
Revenue	11,254	10,387
Reportable Geographical Components [Member] | Color [Member] | North America [Member]
Revenue [Abstract]
Revenue	66,265	66,007
Reportable Geographical Components [Member] | Color [Member] | Europe [Member]
Revenue [Abstract]
Revenue	38,738	42,135
Reportable Geographical Components [Member] | Color [Member] | Asia Pacific [Member]
Revenue [Abstract]
Revenue	15,975	16,425
Reportable Geographical Components [Member] | Color [Member] | Other [Member]
Revenue [Abstract]
Revenue	18,215	15,683
Reportable Geographical Components [Member] | Asia Pacific [Member] | North America [Member]
Revenue [Abstract]
Revenue	0	25
Reportable Geographical Components [Member] | Asia Pacific [Member] | Europe [Member]
Revenue [Abstract]
Revenue	22	41
Reportable Geographical Components [Member] | Asia Pacific [Member] | Asia Pacific [Member]
Revenue [Abstract]
Revenue	29,122	28,266
Reportable Geographical Components [Member] | Asia Pacific [Member] | Other [Member]
Revenue [Abstract]
Revenue	$ 1,153	$ 187