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Segment Information (Segment Operating Profit) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Segment Information [Line Items]
Segment operating profit		$ 95,394	$ 99,778
Corporate, general, and administrative expenses		(40,940)	(41,809)
Interest and financing expenses, net		(4,188)	(3,816)
Gain (loss) on interest rate swap agreement	[1]	(3,854)	(2,408)
Other income (expense), net		1,633	(248)
Income before income tax expense		88,946	93,637
Operating Segments [Member]
Segment Information [Line Items]
Segment operating profit		100,625	107,124
Operating Segments [Member] | Petroleum Additives [Member]
Segment Information [Line Items]
Segment operating profit		100,389	105,025
Operating Segments [Member] | All Other [Member]
Segment Information [Line Items]
Segment operating profit		236	2,099
Corporate, Non-Segment [Member]
Segment Information [Line Items]
Corporate, general, and administrative expenses		$ (5,270)	$ (7,015)
[1] 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.

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Amount of gain (loss) included in earnings for the period from the increase (decrease) in fair value of interest rate derivatives not designated as hedging instruments.

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