Segment Information, Operating Results by Segment (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) Segment	Jun. 30, 2020 USD ($)
Segment Information [Abstract]
Number of reportable segments | Segment			3
Revenue [Abstract]
Revenue	$ 335,827	$ 323,090	$ 695,529	$ 673,767
Operating income (loss)	35,753	42,125	82,650	76,686
Interest expense	3,322	3,608	6,755	7,915
Earnings before income taxes	32,431	38,517	75,895	68,771
Flavors & Extracts [Member]
Revenue [Abstract]
Revenue	174,699	178,430	369,360	359,617
Operating income (loss)	24,536	22,752	51,554	43,623
Interest expense	0	0	0	0
Earnings before income taxes	24,536	22,752	51,554	43,623
Color [Member]
Revenue [Abstract]
Revenue	128,830	116,879	260,031	256,072
Operating income (loss)	25,615	22,263	52,209	51,927
Interest expense	0	0	0	0
Earnings before income taxes	25,615	22,263	52,209	51,927
Asia Pacific [Member]
Revenue [Abstract]
Revenue	32,298	27,781	66,138	58,078
Operating income (loss)	5,793	4,849	12,545	9,908
Interest expense	0	0	0	0
Earnings before income taxes	5,793	4,849	12,545	9,908
Reportable Segments [Member]
Revenue [Abstract]
Revenue	344,925	332,780	715,396	693,222
Reportable Segments [Member] | Flavors & Extracts [Member]
Revenue [Abstract]
Revenue	179,401	183,611	380,312	370,109
Reportable Segments [Member] | Color [Member]
Revenue [Abstract]
Revenue	133,207	121,296	268,927	264,791
Reportable Segments [Member] | Asia Pacific [Member]
Revenue [Abstract]
Revenue	32,317	27,873	66,157	58,322
Intersegment Revenue [Member]
Revenue [Abstract]
Revenue	9,098	9,690	19,867	19,455
Intersegment Revenue [Member] | Flavors & Extracts [Member]
Revenue [Abstract]
Revenue	4,702	5,181	10,952	10,492
Intersegment Revenue [Member] | Color [Member]
Revenue [Abstract]
Revenue	4,377	4,417	8,896	8,719
Intersegment Revenue [Member] | Asia Pacific [Member]
Revenue [Abstract]
Revenue	19	92	19	244
Corporate & Other [Member]
Revenue [Abstract]
Revenue	0	0	0	0
Operating income (loss)	(20,191)	(7,739)	(33,658)	(28,772)
Interest expense	3,322	3,608	6,755	7,915
Earnings before income taxes	$ (23,513)	$ (11,347)	$ (40,413)	$ (36,687)