Segment Information, Operating Results by Segment (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2025 USD ($) Segment	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)
Segment Information [Abstract]
Number of reportable segments | Segment	3
Revenue [Abstract]
Revenue	$ 392,325	$ 384,670
Cost of products sold	260,548	258,121
Selling and administrative expenses	78,247	77,143
Operating income (loss)	53,530	49,406
Interest expense	7,341	7,045
Earnings before income taxes	46,189	42,361
Assets	2,092,668	2,005,682	$ 2,023,794
Capital expenditures	16,854	11,030
Depreciation and amortization	15,074	14,709
Flavors & Extracts [Member]
Revenue [Abstract]
Revenue	187,798	188,022
Cost of products sold	137,934	138,982
Selling and administrative expenses	24,875	25,362
Operating income (loss)	24,989	23,678
Assets	811,518	785,024
Capital expenditures	12,535	4,581
Depreciation and amortization	7,640	7,620
Color [Member]
Revenue [Abstract]
Revenue	162,636	156,364
Cost of products sold	96,437	95,003
Selling and administrative expenses	31,347	29,682
Operating income (loss)	34,852	31,679
Assets	852,073	840,433
Capital expenditures	3,522	5,217
Depreciation and amortization	5,936	5,440
Asia Pacific [Member]
Revenue [Abstract]
Revenue	41,891	40,284
Cost of products sold	24,363	24,029
Selling and administrative expenses	8,086	7,479
Operating income (loss)	9,442	8,776
Assets	125,110	106,980
Capital expenditures	175	390
Depreciation and amortization	548	636
Reportable Segments [Member]
Revenue [Abstract]
Revenue	403,332	393,423
Reportable Segments [Member] | Flavors & Extracts [Member]
Revenue [Abstract]
Revenue	193,681	193,092
Reportable Segments [Member] | Color [Member]
Revenue [Abstract]
Revenue	167,750	160,025
Reportable Segments [Member] | Asia Pacific [Member]
Revenue [Abstract]
Revenue	41,901	40,306
Reportable Segments [Member] | Corporate and Other [Member]
Revenue [Abstract]
Revenue	0	0
Intersegment Revenue [Member]
Revenue [Abstract]
Revenue	(11,007)	(8,753)
Intersegment Revenue [Member] | Flavors & Extracts [Member]
Revenue [Abstract]
Revenue	(5,883)	(5,070)
Intersegment Revenue [Member] | Color [Member]
Revenue [Abstract]
Revenue	(5,114)	(3,661)
Intersegment Revenue [Member] | Asia Pacific [Member]
Revenue [Abstract]
Revenue	(10)	(22)
Intersegment Revenue [Member] | Corporate and Other [Member]
Revenue [Abstract]
Revenue	0	0
Corporate & Other [Member] | Corporate and Other [Member]
Revenue [Abstract]
Revenue	0	0
Cost of products sold	1,814	107
Selling and administrative expenses	13,939	14,620
Operating income (loss)	(15,753)	(14,727)
Assets	303,967	273,245
Capital expenditures	622	842
Depreciation and amortization	$ 950	$ 1,013