Earnings per Share (Tables)

9 Months Ended

Sep. 30, 2020

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				Nine Months Ended
	September 30,				September 30,
	2020		2019		2020		2019
Weighted average basic common shares outstanding		44,491		44,371		44,470		44,349
Effect of dilutive securities:
Performance shares		345		341		—		394
Restricted stock		63		4		—		111
Weighted average diluted common and potential common shares outstanding		44,899		44,716		44,470		44,854

Number of Common Stock Excluded from Diluted Earnings Per Share Calculation

For the nine months ended September 30, 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):

	Nine Months Ended
	September 30, 2020
Performance shares		348
Restricted stock		71