Segment and Geographic Information, Segment and Geographic Info (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue [Abstract]
Revenue from external customers	$ 1,332,001	$ 1,322,934	$ 1,386,815
Long-lived assets	999,274	951,938	1,002,075
North America [Member]
Revenue [Abstract]
Revenue from external customers	733,330	700,098	722,732
Long-lived assets	600,404	552,673	562,314
Europe [Member]
Revenue [Abstract]
Revenue from external customers	289,980	307,631	342,057
Long-lived assets	339,264	344,942	390,845
Asia Pacific [Member]
Revenue [Abstract]
Revenue from external customers	199,921	205,979	213,029
Long-lived assets	36,708	35,782	32,252
Other [Member]
Revenue [Abstract]
Revenue from external customers	108,770	109,226	108,997
Long-lived assets	22,898	18,541	16,664
Flavors & Extracts [Member]
Revenue [Abstract]
Revenue from external customers	724,483	682,705	723,189
Long-lived assets	358,331	355,974	381,626
Color [Member]
Revenue [Abstract]
Revenue from external customers	486,536	522,051	540,499
Long-lived assets	506,532	484,829	515,581
Asia Pacific [Member]
Revenue [Abstract]
Revenue from external customers	120,982	118,178	123,127
Long-lived assets	31,834	31,007	27,872
Reportable Geographical Components [Member] | United States [Member]
Revenue [Abstract]
Revenue from external customers	614,300	575,200	586,200
Long-lived assets	518,200	471,800	484,900
Reportable Geographical Components [Member] | Flavors & Extracts [Member] | North America [Member]
Revenue [Abstract]
Revenue from external customers	491,641	448,393	477,083
Long-lived assets	244,921	251,822	255,131
Reportable Geographical Components [Member] | Flavors & Extracts [Member] | Europe [Member]
Revenue [Abstract]
Revenue from external customers	160,083	158,902	173,562
Long-lived assets	112,424	102,631	125,157
Reportable Geographical Components [Member] | Flavors & Extracts [Member] | Asia Pacific [Member]
Revenue [Abstract]
Revenue from external customers	30,080	32,203	31,506
Long-lived assets	204	1,017	1,061
Reportable Geographical Components [Member] | Flavors & Extracts [Member] | Other [Member]
Revenue [Abstract]
Revenue from external customers	42,679	43,207	41,038
Long-lived assets	782	504	277
Reportable Geographical Components [Member] | Color [Member] | North America [Member]
Revenue [Abstract]
Revenue from external customers	241,608	251,593	245,649
Long-lived assets	252,906	220,723	230,187
Reportable Geographical Components [Member] | Color [Member] | Europe [Member]
Revenue [Abstract]
Revenue from external customers	129,704	148,393	168,340
Long-lived assets	226,840	242,311	265,688
Reportable Geographical Components [Member] | Color [Member] | Asia Pacific [Member]
Revenue [Abstract]
Revenue from external customers	52,414	57,268	59,548
Long-lived assets	4,670	3,758	3,319
Reportable Geographical Components [Member] | Color [Member] | Other [Member]
Revenue [Abstract]
Revenue from external customers	62,810	64,797	66,962
Long-lived assets	22,116	18,037	16,387
Reportable Geographical Components [Member] | Asia Pacific [Member] | North America [Member]
Revenue [Abstract]
Revenue from external customers	81	112	0
Long-lived assets	0	0	0
Reportable Geographical Components [Member] | Asia Pacific [Member] | Europe [Member]
Revenue [Abstract]
Revenue from external customers	193	336	155
Long-lived assets	0	0	0
Reportable Geographical Components [Member] | Asia Pacific [Member] | Asia Pacific [Member]
Revenue [Abstract]
Revenue from external customers	117,427	116,508	121,975
Long-lived assets	31,834	31,007	27,872
Reportable Geographical Components [Member] | Asia Pacific [Member] | Other [Member]
Revenue [Abstract]
Revenue from external customers	3,281	1,222	997
Long-lived assets	0	0	0
Intersegment Revenue [Member]
Revenue [Abstract]
Revenue from external customers	32,279	30,829	37,285
Intersegment Revenue [Member] | Flavors & Extracts [Member]
Revenue [Abstract]
Revenue from external customers	17,552	17,651	23,743
Intersegment Revenue [Member] | Color [Member]
Revenue [Abstract]
Revenue from external customers	14,482	13,108	13,505
Intersegment Revenue [Member] | Asia Pacific [Member]
Revenue [Abstract]
Revenue from external customers	245	70	37
Corporate & Other [Member]
Revenue [Abstract]
Revenue from external customers	0	0	0
Long-lived assets	102,577	80,128	76,996
Corporate & Other [Member] | North America [Member]
Revenue [Abstract]
Revenue from external customers	0	0	0
Long-lived assets	102,577	80,128	76,996
Corporate & Other [Member] | Europe [Member]
Revenue [Abstract]
Revenue from external customers	0	0	0
Long-lived assets	0	0	0
Corporate & Other [Member] | Asia Pacific [Member]
Revenue [Abstract]
Revenue from external customers	0	0	0
Long-lived assets	0	0	0
Corporate & Other [Member] | Other [Member]
Revenue [Abstract]
Revenue from external customers	0	0	0
Long-lived assets	$ 0	$ 0	$ 0