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Segment Information (Segment Operating Profit) (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]
Segment operating profit	$ 78,727	$ 63,105	$ 245,608	$ 222,353
Corporate, general, and administrative expenses	(35,192)	(39,729)	(109,303)	(111,379)
Interest and financing expenses, net	(8,369)	(9,345)	(24,859)	(24,557)
Loss on early extinguishment of debt	0	0	(7,545)	0
Other income (expense), net	9,971	7,393	26,240	19,785
Income before income tax expense	80,329	61,153	239,444	217,581
Operating Segments [Member]
Segment Information [Line Items]
Segment operating profit	82,982	71,977	260,925	239,601
Operating Segments [Member] | Petroleum Additives [Member]
Segment Information [Line Items]
Segment operating profit	83,023	72,128	261,130	240,399
Operating Segments [Member] | All Other [Member]
Segment Information [Line Items]
Segment operating profit	(41)	(151)	(205)	(798)
Corporate, Non-Segment [Member]
Segment Information [Line Items]
Corporate, general, and administrative expenses	(4,167)	(8,731)	(15,389)	(16,591)
Interest and financing expenses, net	(8,369)	(9,345)	(24,859)	(24,557)
Loss on early extinguishment of debt	0	0	(7,545)	0
Other income (expense), net	$ 9,883	$ 7,252	$ 26,312	$ 19,128

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