Segment Information, Operating Results by Segment (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) Segment	Mar. 31, 2020 USD ($)
Segment Information [Abstract]
Number of reportable segments | Segment	3
Revenue [Abstract]
Revenue	$ 359,702	$ 350,677
Operating income (loss)	46,897	34,561
Interest expense	3,433	4,307
Earnings (loss) before income taxes	43,464	30,254
Flavors & Extracts [Member]
Revenue [Abstract]
Revenue	194,661	181,187
Operating income (loss)	27,018	20,871
Interest expense	0	0
Earnings (loss) before income taxes	27,018	20,871
Color [Member]
Revenue [Abstract]
Revenue	131,201	139,193
Operating income (loss)	26,594	29,664
Interest expense	0	0
Earnings (loss) before income taxes	26,594	29,664
Asia Pacific [Member]
Revenue [Abstract]
Revenue	33,840	30,297
Operating income (loss)	6,752	5,059
Interest expense	0	0
Earnings (loss) before income taxes	6,752	5,059
Reportable Segments [Member]
Revenue [Abstract]
Revenue	370,471	360,442
Reportable Segments [Member] | Flavors & Extracts [Member]
Revenue [Abstract]
Revenue	200,911	186,498
Reportable Segments [Member] | Color [Member]
Revenue [Abstract]
Revenue	135,720	143,495
Reportable Segments [Member] | Asia Pacific [Member]
Revenue [Abstract]
Revenue	33,840	30,449
Intersegment Revenue [Member]
Revenue [Abstract]
Revenue	10,769	9,765
Intersegment Revenue [Member] | Flavors & Extracts [Member]
Revenue [Abstract]
Revenue	6,250	5,311
Intersegment Revenue [Member] | Color [Member]
Revenue [Abstract]
Revenue	4,519	4,302
Intersegment Revenue [Member] | Asia Pacific [Member]
Revenue [Abstract]
Revenue	0	152
Corporate & Other [Member]
Revenue [Abstract]
Revenue	0	0
Operating income (loss)	(13,467)	(21,033)
Interest expense	3,433	4,307
Earnings (loss) before income taxes	$ (16,900)	$ (25,340)