Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Intangible assets [Abstract]
Cost	$ 39,192	$ 24,643
Accumulated Amortization	(20,325)	(17,432)
Intangible assets expense [Abstract]
Amortization expense of intangible assets	2,300	1,600	$ 1,300
Estimated Amortization Expense [Abstract]
2019	2,300
2020	2,300
2021	2,100
2022	2,000
2023	1,700
Goodwill activity [Roll Forward]
Balance as of beginning of period	408,995	383,568
Currency translation impact	(9,108)	25,427
Acquisitions	16,288
Balance as of end of period	$ 416,175	408,995	383,568
Weighted Average [Member]
Intangible assets [Abstract]
Weighted Average Amortization Years	17 years 2 months 12 days
Flavors and Fragrances [Member]
Goodwill activity [Roll Forward]
Balance as of beginning of period	$ 114,993	109,369
Currency translation impact	(891)	5,624
Acquisitions	0
Balance as of end of period	114,102	114,993	109,369
Color [Member]
Goodwill activity [Roll Forward]
Balance as of beginning of period	290,889	272,006
Currency translation impact	(8,269)	18,883
Acquisitions	7,434
Balance as of end of period	290,054	290,889	272,006
Asia Pacific [Member]
Goodwill activity [Roll Forward]
Balance as of beginning of period	3,113	2,193
Currency translation impact	52	920
Acquisitions	0
Balance as of end of period	3,165	3,113	2,193
Corporate & Other [Member]
Goodwill activity [Roll Forward]
Balance as of beginning of period	0	0
Currency translation impact	0	0
Acquisitions	8,854
Balance as of end of period	8,854	0	$ 0
Technological Know-how [Member]
Intangible assets [Abstract]
Cost	14,570	7,510
Accumulated Amortization	$ (6,768)	(6,505)
Technological Know-how [Member] | Weighted Average [Member]
Intangible assets [Abstract]
Weighted Average Amortization Years	18 years 10 months 24 days
Customer Relationships [Member]
Intangible assets [Abstract]
Cost	$ 8,761	6,869
Accumulated Amortization	$ (5,673)	(5,244)
Customer Relationships [Member] | Weighted Average [Member]
Intangible assets [Abstract]
Weighted Average Amortization Years	17 years 4 months 24 days
Patents, Trademarks, Non-compete Agreements and Other [Member]
Intangible assets [Abstract]
Cost	$ 15,861	10,264
Accumulated Amortization	$ (7,884)	$ (5,683)
Patents, Trademarks, Non-compete Agreements and Other [Member] | Weighted Average [Member]
Intangible assets [Abstract]
Weighted Average Amortization Years	15 years 4 months 24 days