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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
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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

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