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Segment Information (Tables)
9 Months Ended
Sep. 30, 2018
Segment Reporting [Abstract]  
Net Sales by Segment
Net Sales by Segment
 
 
Third Quarter Ended
September 30,
 
Nine Months Ended
September 30,
(in thousands)
 
2018
 
2017
 
2018
 
2017
Petroleum additives
 
 
 
 
 
 
 
 
     Lubricant additives
 
$
462,865

 
$
443,355

 
$
1,440,227

 
$
1,340,693

     Fuel additives
 
97,657

 
102,804

 
303,405

 
289,652

          Total
 
560,522

 
546,159

 
1,743,632

 
1,630,345

All other
 
2,644

 
2,257

 
7,731

 
8,077

Net sales
 
$
563,166

 
$
548,416

 
$
1,751,363

 
$
1,638,422

Segment Operating Profit
Segment Operating Profit
 
 
Third Quarter Ended
September 30,
 
Nine Months Ended
September 30,
(in thousands)
 
2018
 
2017
 
2018
 
2017
Petroleum additives
 
$
75,824

 
$
84,173

 
$
231,494

 
$
270,841

All other
 
(2,295
)
 
1,093

 
(1,966
)
 
2,943

Segment operating profit
 
73,529

 
85,266

 
229,528

 
273,784

Corporate, general, and administrative expenses
 
(5,402
)
 
(6,534
)
 
(16,033
)
 
(17,561
)
Interest and financing expenses, net
 
(7,807
)
 
(5,564
)
 
(18,536
)
 
(16,496
)
Other income (expense), net
 
7,994

 
3,809

 
24,231

 
10,773

Income before income tax expense
 
$
68,314

 
$
76,977

 
$
219,190

 
$
250,500