Earnings per Share (Tables)

3 Months Ended

Mar. 31, 2021

Schedule of Weighted Average Number of Shares

The following table summarizes the calculation of weighted average common shares outstanding used in the computation of diluted earnings per share (in thousands):

	Three Months Ended
	March 31,
	2021		2020
Weighted average basic common shares outstanding		45,177		44,447
Effect of dilutive securities:
Performance shares		516		—
Restricted stock		271		—
Weighted average diluted common and potential common shares outstanding		45,964		44,447

Number of Common Stock Excluded from Diluted Earnings Per Share Calculation

For the three months ended March 31, 2020, the number of outstanding performance and restricted shares of Core Laboratories N.V. common stock that were excluded from the diluted earnings per share calculation, as their impact would be antidilutive, were as follows (in thousands):

	Three Months Ended
	March 31, 2020
Performance shares		398
Restricted stock		9