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v3.20.4

Segment and Geographic Area Information (Schedule Of Asset Information By Segment) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Total assets | $ 1,933,875 | $ 1,885,132
Cash and cash equivalents | 125,172 | 144,397
Trade and other accounts receivable, net | 336,395 | 335,826
Prepaid expenses and other current assets | 35,480 | 33,237
Property, plant, and equipment, net | 665,147 | 635,439
Prepaid pension cost | 137,069 | 133,848
Deferred charges and other assets | 42,308 | 44,062
Petroleum Additives [Member] |  |
Segment Reporting Information [Line Items] |  |
Total assets | 1,557,834 | 1,506,690
All Other [Member] |  |
Segment Reporting Information [Line Items] |  |
Total assets | 18,383 | 14,519
Operating Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Total assets | 1,576,217 | 1,521,209
Corporate [Member] |  |
Segment Reporting Information [Line Items] |  |
Cash and cash equivalents | 125,172 | 144,397
Trade and other accounts receivable, net | 13,566 | 6,068
Prepaid expenses and other current assets | 35,480 | 33,237
Property, plant, and equipment, net | 31,839 | 34,648
Prepaid pension cost | 137,069 | 133,848
Lease right-of-use assets | 198 | 302
Deferred charges and other assets | $ 14,334 | $ 11,423

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