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Segment Information (Net Sales By Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Information [Line Items]
Net sales	$ 710,228	$ 685,130	$ 1,406,964	$ 1,387,919
Operating Segments [Member] | Petroleum Additives [Member]
Segment Information [Line Items]
Net sales	669,826	683,969	1,347,090	1,383,960
Operating Segments [Member] | All Other [Member]
Segment Information [Line Items]
Net sales	2,392	1,161	4,817	3,959
Operating Segments [Member] | Lubricant Additives [Member] | Petroleum Additives [Member]
Segment Information [Line Items]
Net sales	575,194	588,506	1,147,109	1,191,080
Operating Segments [Member] | Fuel Additives [Member] | Petroleum Additives [Member]
Segment Information [Line Items]
Net sales	94,632	95,463	199,981	192,880
Operating Segments [Member] | Specialty materials | Specialty materials
Segment Information [Line Items]
Net sales	$ 38,010	$ 0	$ 55,057	$ 0

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