Segment Information, Revenue from External Customers by Geographic Markets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue [Abstract]
Revenue	$ 347,513	$ 356,477
North America [Member]
Revenue [Abstract]
Revenue	178,779	182,637
Europe [Member]
Revenue [Abstract]
Revenue	90,177	89,064
Asia Pacific [Member]
Revenue [Abstract]
Revenue	52,300	53,943
Other [Member]
Revenue [Abstract]
Revenue	26,257	30,833
Flavors & Fragrances [Member]
Revenue [Abstract]
Revenue	178,744	182,482
Color [Member]
Revenue [Abstract]
Revenue	140,250	143,728
Asia Pacific [Member]
Revenue [Abstract]
Revenue	28,519	30,267
Reportable Geographical Components [Member] | Flavors & Fragrances [Member] | North America [Member]
Revenue [Abstract]
Revenue	112,747	119,055
Reportable Geographical Components [Member] | Flavors & Fragrances [Member] | Europe [Member]
Revenue [Abstract]
Revenue	48,001	45,427
Reportable Geographical Components [Member] | Flavors & Fragrances [Member] | Asia Pacific [Member]
Revenue [Abstract]
Revenue	7,609	7,022
Reportable Geographical Components [Member] | Flavors & Fragrances [Member] | Other [Member]
Revenue [Abstract]
Revenue	10,387	10,978
Reportable Geographical Components [Member] | Color [Member] | North America [Member]
Revenue [Abstract]
Revenue	66,007	63,582
Reportable Geographical Components [Member] | Color [Member] | Europe [Member]
Revenue [Abstract]
Revenue	42,135	43,631
Reportable Geographical Components [Member] | Color [Member] | Asia Pacific [Member]
Revenue [Abstract]
Revenue	16,425	16,910
Reportable Geographical Components [Member] | Color [Member] | Other [Member]
Revenue [Abstract]
Revenue	15,683	19,605
Reportable Geographical Components [Member] | Asia Pacific [Member] | North America [Member]
Revenue [Abstract]
Revenue	25	0
Reportable Geographical Components [Member] | Asia Pacific [Member] | Europe [Member]
Revenue [Abstract]
Revenue	41	6
Reportable Geographical Components [Member] | Asia Pacific [Member] | Asia Pacific [Member]
Revenue [Abstract]
Revenue	28,266	30,011
Reportable Geographical Components [Member] | Asia Pacific [Member] | Other [Member]
Revenue [Abstract]
Revenue	$ 187	$ 250