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Segment Information (Net Sales By Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Information [Line Items]
Net sales	$ 696,049	$ 622,207	$ 2,082,240	$ 1,779,543
Operating Segments [Member] | Petroleum Additives [Member]
Segment Information [Line Items]
Net sales	692,693	619,070	2,074,018	1,770,555
Operating Segments [Member] | All Other [Member]
Segment Information [Line Items]
Net sales	3,356	3,137	8,222	8,988
Operating Segments [Member] | Lubricant Additives [Member] | Petroleum Additives [Member]
Segment Information [Line Items]
Net sales	582,559	527,142	1,775,574	1,520,475
Operating Segments [Member] | Fuel Additives [Member] | Petroleum Additives [Member]
Segment Information [Line Items]
Net sales	$ 110,134	$ 91,928	$ 298,444	$ 250,080

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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