Accumulated Other Comprehensive Income (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 835,741
Other comprehensive income before reclassifications	55,858
Amounts reclassified from OCI	8,273
Ending balance	852,301
Flavors & Fragrances [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification of cumulative translation loss, net	(2,800)
European Natural Ingredients Business [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification of cumulative translation loss, net	(4,000)
Accumulated Other Comprehensive Loss [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(213,465)
Ending balance	(149,334)
Cash Flow Hedges [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(85)	[1]
Other comprehensive income before reclassifications	(768)	[1]
Amounts reclassified from OCI	184	[1]
Ending balance	(669)	[1]
Pension Items [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(2,537)	[1]
Other comprehensive income before reclassifications	921	[1]
Amounts reclassified from OCI	1,307	[1]
Ending balance	(309)	[1]
Reclassification of cumulative translation loss, net	(1,500)
Foreign Currency Items [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(210,843)
Other comprehensive income before reclassifications	55,705
Amounts reclassified from OCI	6,782
Ending balance	$ (148,356)

[1] Cash Flow Hedges and Pension Items are net of tax.