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Segment Information (Net Sales By Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Information [Line Items]
Net sales	$ 563,166	$ 548,416	$ 1,751,363	$ 1,638,422
Operating Segments [Member] | Petroleum Additives [Member]
Segment Information [Line Items]
Net sales	560,522	546,159	1,743,632	1,630,345
Operating Segments [Member] | All Other [Member]
Segment Information [Line Items]
Net sales	2,644	2,257	7,731	8,077
Operating Segments [Member] | Lubricant Additives [Member] | Petroleum Additives [Member]
Segment Information [Line Items]
Net sales	462,865	443,355	1,440,227	1,340,693
Operating Segments [Member] | Fuel Additives [Member] | Petroleum Additives [Member]
Segment Information [Line Items]
Net sales	$ 97,657	$ 102,804	$ 303,405	$ 289,652

X

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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