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Segment and Geographic Area Information (Schedule of Additions to Long-lived Assets and Depreciation and Amortization) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Additions to long-lived assets	$ 111,992	$ 88,815	$ 74,638
Depreciation and amortization	84,002	87,560	71,759
Petroleum Additives [Member]
Segment Reporting Information [Line Items]
Additions to long-lived assets	109,536	85,711	72,829
Depreciation and amortization	80,811	84,872	69,029
All Other [Member]
Segment Reporting Information [Line Items]
Additions to long-lived assets	3	28	0
Depreciation and amortization	52	52	11
Corporate [Member]
Segment Reporting Information [Line Items]
Additions to long-lived assets	2,453	3,076	1,809
Depreciation and amortization	$ 3,139	$ 2,636	$ 2,719

X

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

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X

- Definition

The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585

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- Definition

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.

+ References

No definition available.

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