Segment and Geographic Information, Reportable Segments (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) Segment	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Segment and Geographic Information [Abstract]
Number of reportable segment | Segment	3
Divestiture and other related costs			$ 0
Restructuring and other costs			0
Revenue [Abstract]
Revenue	$ 1,332,001	$ 1,322,934	1,386,815
Operating income (loss)	152,656	121,110	203,378
Interest expense	14,811	20,107	21,853
Earnings before income taxes	137,845	101,003	181,525
Assets	1,740,860	1,740,151	1,824,940
Capital expenditures	52,162	39,100	50,740
Depreciation and amortization	49,641	55,015	53,244
Flavors & Extracts [Member]
Revenue [Abstract]
Revenue	724,483	682,705	723,189
Operating income (loss)	90,974	74,961	96,433
Interest expense	0	0	0
Earnings before income taxes	90,974	74,961	96,433
Assets	686,348	714,779	782,145
Capital expenditures	24,541	16,968	23,679
Depreciation and amortization	24,801	27,179	25,922
Color [Member]
Revenue [Abstract]
Revenue	486,536	522,051	540,499
Operating income (loss)	96,034	101,190	113,306
Interest expense	0	0	0
Earnings before income taxes	96,034	101,190	113,306
Assets	718,665	734,343	752,305
Capital expenditures	19,840	16,521	21,744
Depreciation and amortization	19,368	22,088	21,931
Asia Pacific [Member]
Revenue [Abstract]
Revenue	120,982	118,178	123,127
Operating income (loss)	22,075	19,382	20,856
Interest expense	0	0	0
Earnings before income taxes	22,075	19,382	20,856
Assets	100,258	99,183	103,808
Capital expenditures	2,687	2,545	2,858
Depreciation and amortization	2,578	2,581	2,451
Reportable Segments [Member]
Revenue [Abstract]
Revenue	1,364,280	1,353,763	1,424,100
Reportable Segments [Member] | Flavors & Extracts [Member]
Revenue [Abstract]
Revenue	742,035	700,356	746,932
Reportable Segments [Member] | Color [Member]
Revenue [Abstract]
Revenue	501,018	535,159	554,004
Reportable Segments [Member] | Asia Pacific [Member]
Revenue [Abstract]
Revenue	121,227	118,248	123,164
Intersegment Revenue [Member]
Revenue [Abstract]
Revenue	32,279	30,829	37,285
Intersegment Revenue [Member] | Flavors & Extracts [Member]
Revenue [Abstract]
Revenue	17,552	17,651	23,743
Intersegment Revenue [Member] | Color [Member]
Revenue [Abstract]
Revenue	14,482	13,108	13,505
Intersegment Revenue [Member] | Asia Pacific [Member]
Revenue [Abstract]
Revenue	245	70	37
Corporate & Other [Member]
Revenue [Abstract]
Revenue	0	0	0
Operating income (loss)	(56,427)	(74,423)	(27,217)
Interest expense	14,811	20,107	21,853
Earnings before income taxes	(71,238)	(94,530)	(49,070)
Assets	235,589	191,846	186,682
Capital expenditures	5,094	3,066	2,459
Depreciation and amortization	$ 2,894	$ 3,167	$ 2,940