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Segment Information (Consolidated Revenue By Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Segment Information [Line Items]
Consolidated revenue	$ 562,608	$ 562,679
Petroleum Additives [Member]
Segment Information [Line Items]
Consolidated revenue	558,400	557,692
Real Estate Development [Member]
Segment Information [Line Items]
Consolidated revenue	2,858	2,858
All Other [Member]
Segment Information [Line Items]
Consolidated revenue	1,350	2,129
Lubricant Additives [Member] | Petroleum Additives [Member]
Segment Information [Line Items]
Consolidated revenue	452,672	444,545
Fuel Additives [Member] | Petroleum Additives [Member]
Segment Information [Line Items]
Consolidated revenue	$ 105,728	$ 113,147

X

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_SegmentReportingInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration