v3.25.2
Segment Information (Schedule Of Net Sales And Operating Profit By Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Information [Line Items]        
Net sales $ 698,509 $ 710,228 $ 1,399,455 $ 1,406,964
Cost of goods sold 477,555 491,773 942,478 972,144
Research, development, and testing expenses 32,374 28,663 65,550 59,863
Segment operating profit 143,152 146,952 303,021 287,752
Corporate, general, and administrative expenses (45,428) (42,840) (88,406) (87,205)
Interest and financing expenses, net (10,735) (15,910) (21,435) (31,564)
Other income (expense), net 15,271 11,952 30,215 24,499
Income before income tax expense 147,688 142,994 311,801 280,687
Operating Segments [Member]        
Segment Information [Line Items]        
Segment operating profit 150,382 152,791 315,676 298,733
Operating Segments [Member] | Petroleum Additives [Member]        
Segment Information [Line Items]        
Net sales 653,875 669,826 1,299,429 1,347,090
Cost of goods sold (448,474) (461,617) (886,220) (924,536)
Research, development, and testing expenses (32,374) (28,663) (65,550) (59,863)
Other segment items (33,192) (31,727) (65,717) (63,963)
Segment operating profit 139,835 147,819 281,942 298,728
Operating Segments [Member] | All Other [Member]        
Segment Information [Line Items]        
Net sales 2,597 2,392 4,268 4,817
Segment operating profit (1,171) (1,374) (1,652) (1,455)
Operating Segments [Member] | Specialty Materials [Member]        
Segment Information [Line Items]        
Net sales 42,037 38,010 95,758 55,057
Other segment items (31,490) (33,038) (62,024) (55,052)
Segment operating profit 10,547 4,972 33,734 5
Operating Segments [Member] | Lubricant additives [Member] | Petroleum Additives [Member]        
Segment Information [Line Items]        
Net sales 556,479 575,194 1,115,657 1,147,109
Operating Segments [Member] | Fuel additives [Member] | Petroleum Additives [Member]        
Segment Information [Line Items]        
Net sales 97,396 94,632 183,772 199,981
Corporate, Non-Segment [Member]        
Segment Information [Line Items]        
Corporate, general, and administrative expenses (6,414) (3,985) (11,300) (9,542)
Interest and financing expenses, net (10,735) (15,910) (21,435) (31,564)
Other income (expense), net $ 15,626 $ 11,472 $ 30,512 $ 24,515