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Segment and Geographic Area Information (Schedule Of Net Sales And Operating Profit By Segment) (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) customer	Dec. 31, 2019 USD ($) customer	Dec. 31, 2018 USD ($) customer
Segment Reporting Information [Line Items]
Net sales	$ 527,781	$ 512,869	$ 410,864	$ 559,417	$ 534,445	$ 555,817	$ 563,417	$ 536,616	$ 2,010,931	$ 2,190,295	$ 2,289,675
Segment operating profit									311,802	337,321	292,674
Corporate, general, and administrative expenses									(142,863)	(148,083)	(152,400)
Interest and financing expenses, net									(26,328)	(29,241)	(26,723)
Other income (expense), net									45,813	23,510	24,334
Income before income tax expense									$ 331,287	$ 331,590	$ 290,285
Number of customers that exceeded threshold percentage | customer									0	0	0
Operating Segments [Member]
Segment Reporting Information [Line Items]
Segment operating profit									$ 333,141	$ 357,666	$ 307,763
Operating Segments [Member] | Petroleum Additives [Member]
Segment Reporting Information [Line Items]
Net sales									2,001,567	2,175,904	2,280,803
Segment operating profit									333,241	359,228	311,019
Operating Segments [Member] | All Other [Member]
Segment Reporting Information [Line Items]
Net sales									9,364	14,391	8,872
Segment operating profit									(100)	(1,562)	(3,256)
Operating Segments [Member] | Lubricant additives [Member] | Petroleum Additives [Member]
Segment Reporting Information [Line Items]
Net sales									1,686,649	1,778,473	1,870,803
Operating Segments [Member] | Fuel additives [Member] | Petroleum Additives [Member]
Segment Reporting Information [Line Items]
Net sales									314,918	397,431	410,000
Corporate [Member]
Segment Reporting Information [Line Items]
Corporate, general, and administrative expenses									(21,744)	(20,345)	(19,651)
Interest and financing expenses, net									(26,328)	(29,241)	(26,723)
Other income (expense), net									$ 46,218	$ 23,510	$ 28,896

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