Segment and Geographic Information, Segment and Geographic Info (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	$ 1,322,934	$ 1,386,815	$ 1,362,265
Long-lived assets	951,938	1,002,075	990,865
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	700,098	722,732	718,708
Long-lived assets	552,673	562,314	540,859
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	307,631	342,057	324,597
Long-lived assets	344,942	390,845	409,024
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	205,979	213,029	208,935
Long-lived assets	35,782	32,252	33,406
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	109,226	108,997	110,025
Long-lived assets	18,541	16,664	7,576
Flavors & Fragrances [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	682,705	723,189	727,026
Long-lived assets	355,974	381,626	387,672
Color [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	522,051	540,499	512,811
Long-lived assets	484,829	515,581	496,144
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	118,178	123,127	122,428
Long-lived assets	31,007	27,872	28,936
Reportable Geographical Components [Member] | United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	575,200	586,200	574,500
Long-lived assets	471,800	484,900	485,200
Reportable Geographical Components [Member] | Flavors & Fragrances [Member] | North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	448,393	477,083	487,034
Long-lived assets	251,822	255,131	255,000
Reportable Geographical Components [Member] | Flavors & Fragrances [Member] | Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	158,902	173,562	164,641
Long-lived assets	102,631	125,157	130,897
Reportable Geographical Components [Member] | Flavors & Fragrances [Member] | Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	32,203	31,506	32,717
Long-lived assets	1,017	1,061	1,395
Reportable Geographical Components [Member] | Flavors & Fragrances [Member] | Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	43,207	41,038	42,634
Long-lived assets	504	277	380
Reportable Geographical Components [Member] | Color [Member] | North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	251,593	245,649	231,674
Long-lived assets	220,723	230,187	207,746
Reportable Geographical Components [Member] | Color [Member] | Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	148,393	168,340	159,646
Long-lived assets	242,311	265,688	278,127
Reportable Geographical Components [Member] | Color [Member] | Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	57,268	59,548	55,108
Long-lived assets	3,758	3,319	3,075
Reportable Geographical Components [Member] | Color [Member] | Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	64,797	66,962	66,383
Long-lived assets	18,037	16,387	7,196
Reportable Geographical Components [Member] | Asia Pacific [Member] | North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	112	0	0
Long-lived assets	0	0	0
Reportable Geographical Components [Member] | Asia Pacific [Member] | Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	336	155	310
Long-lived assets	0	0	0
Reportable Geographical Components [Member] | Asia Pacific [Member] | Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	116,508	121,975	121,110
Long-lived assets	31,007	27,872	28,936
Reportable Geographical Components [Member] | Asia Pacific [Member] | Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	1,222	997	1,008
Long-lived assets	0	0	0
Intersegment Revenue [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	(30,829)	(37,285)	(34,234)
Intersegment Revenue [Member] | Flavors & Fragrances [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	(17,651)	(23,743)	(19,917)
Intersegment Revenue [Member] | Color [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	(13,108)	(13,505)	(13,552)
Intersegment Revenue [Member] | Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	(70)	(37)	(765)
Corporate & Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	0	0	0
Long-lived assets	80,128	76,996	78,113
Corporate & Other [Member] | North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	0	0	0
Long-lived assets	80,128	76,996	78,113
Corporate & Other [Member] | Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	0	0	0
Long-lived assets	0	0	0
Corporate & Other [Member] | Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	0	0	0
Long-lived assets	0	0	0
Corporate & Other [Member] | Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from external customers	0	0	0
Long-lived assets	$ 0	$ 0	$ 0