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Segment Information (Segment Operating Profit) (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]        
Segment operating profit $ 146,952 $ 124,242 $ 287,752 $ 249,283
Corporate, general, and administrative expenses (42,840) (37,438) (87,205) (77,285)
Interest and financing expenses, net (15,910) (10,255) (31,564) (21,028)
Other income (expense), net 11,952 10,723 24,499 21,603
Income before income tax expense 142,994 124,710 280,687 249,858
Operating Segments [Member]        
Segment Information [Line Items]        
Segment operating profit 151,417 131,116 297,278 262,209
Operating Segments [Member] | Petroleum Additives [Member]        
Segment Information [Line Items]        
Segment operating profit 147,819 132,138 298,728 264,206
Operating Segments [Member] | Specialty materials        
Segment Information [Line Items]        
Segment operating profit 4,972 0 5 0
Operating Segments [Member] | All Other [Member]        
Segment Information [Line Items]        
Segment operating profit (1,374) (1,022) (1,455) (1,997)
Corporate, Non-Segment [Member]        
Segment Information [Line Items]        
Corporate, general, and administrative expenses (3,985) (6,810) (9,542) (13,301)
Interest and financing expenses, net (15,910) (10,255) (31,564) (21,028)
Other income (expense), net $ 11,472 $ 10,659 $ 24,515 $ 21,978