Goodwill and Intangible Assets, Goodwill (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Dec. 31, 2019	Dec. 31, 2019		Dec. 31, 2018
Goodwill activity [Roll Forward]
Balance as of beginning of period			$ 416,175		$ 408,995
Currency translation impact			(748)		(9,108)
Acquisitions					16,288
Goodwill related to divestitures		$ (8,400)	(8,385)	[1]
Balance as of end of period		407,042	407,042		416,175
Flavors and Fragrances [Member]
Goodwill activity [Roll Forward]
Balance as of beginning of period			112,086		112,977
Currency translation impact			(184)		(891)
Acquisitions					0
Goodwill related to divestitures	[1]		(3,754)
Balance as of end of period		108,148	108,148		112,086
Color [Member]
Goodwill activity [Roll Forward]
Balance as of beginning of period			298,908		290,889
Currency translation impact			(641)		(8,269)
Acquisitions					16,288
Goodwill related to divestitures	[1]		(4,631)
Balance as of end of period		293,636	293,636		298,908
Asia Pacific [Member]
Goodwill activity [Roll Forward]
Balance as of beginning of period			5,181		5,129
Currency translation impact			77		52
Acquisitions					0
Goodwill related to divestitures	[1]		0
Balance as of end of period		$ 5,258	$ 5,258		$ 5,181

[1] In the fourth quarter of 2019, the Company met all of the assets held for sale criteria related to the anticipated divestitures of its inks and fragrances (excluding its essential oils product line) product lines. Goodwill of $8.4 million was allocated to those disposal groups and was determined to be fully impaired based on the estimated fair value of each of the disposal groups. See Note 15, Divestitures, for additional information.