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Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement, Noncash Expense [Abstract]

Schedule of Restricted Stock and Restricted Stock Unit Activity

A summary of activity during 2020 related to NewMarket’s restricted stock and restricted stock units (stock awards) is presented below in whole shares:

						Number of Shares						Weighted Average Grant-Date Fair Value
Unvested stock awards at January 1, 2020						21,111						$	427.14
Granted in 2020						6,779						414.33
Vested in 2020						4,708						428.54
Forfeited in 2020						2,268						428.07
Unvested stock awards at December 31, 2020						20,914						422.57

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- Definition

Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year.

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