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Segment Information (Tables)
 3 Months Ended
Mar. 31, 2016
Segment Reporting [Abstract]  
Consolidated Revenue by Segment
Consolidated Revenue by Segment
 
 
Three Months Ended
March 31,
(in thousands)
 
2016
 
2015
Petroleum additives
 
 
 
 
     Lubricant additives
 
$
418,852

 
$
453,722

     Fuel additives
 
87,291

 
101,043

          Total
 
506,143

 
554,765

All other
 
3,784

 
4,801

Consolidated revenue
 
$
509,927

 
$
559,566
Segment Operating Profit
Segment Operating Profit
 
 
Three Months Ended
March 31,
(in thousands)
 
2016
 
2015
Petroleum additives
 
$
100,389

 
$
105,025

All other
 
236

 
2,099

Segment operating profit
 
100,625

 
107,124

Corporate, general, and administrative expenses
 
(5,270
)
 
(7,015
)
Interest and financing expenses, net
 
(4,188
)
 
(3,816
)
Gain (loss) on interest rate swap agreement (a)
 
(3,854
)
 
(2,408
)
Other income (expense), net
 
1,633

 
(248
)
Income before income tax expense
 
$
88,946

 
$
93,637

 
(a)
The gain (loss) on interest rate swap agreement represents the change, since the beginning of the reporting period, in the fair value of an interest rate swap which we entered into on June 25, 2009. We are not using hedge accounting to record the interest rate swap, and accordingly, any change in the fair value is immediately recognized in earnings.