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Segment Information
 6 Months Ended
Jun. 30, 2024
Segment Reporting [Abstract]  
Segment Information Segment Information
The tables below show our consolidated segment results. The “All other” category includes the operations of the antiknock compounds business, as well as certain contracted manufacturing and related services associated with Ethyl Corporation (Ethyl).
Net Sales by Segment
Second Quarter Ended June 30,Six Months Ended June 30,
(in thousands)2024202320242023
Petroleum additives
     Lubricant additives$575,194 $588,506 $1,147,109 $1,191,080 
     Fuel additives94,632 95,463 199,981 192,880 
          Total669,826 683,969 1,347,090 1,383,960 
Specialty materials38,010 0 55,057 0 
All other2,392 1,161 4,817 3,959 
Net sales$710,228 $685,130 $1,406,964 $1,387,919 

Segment Operating Profit
Second Quarter Ended June 30,Six Months Ended June 30,
(in thousands)2024202320242023
Petroleum additives$147,819 $132,138 $298,728 $264,206 
Specialty materials4,972 0 5 0 
All other(1,374)(1,022)(1,455)(1,997)
Segment operating profit151,417 131,116 297,278 262,209 
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), net11,472 10,659 24,515 21,978 
Income before income tax expense
$142,994 $124,710 $280,687 $249,858