Earnings per Share

6 Months Ended

Jun. 30, 2020

Earnings Per Share [Abstract]

Earnings per Share

10. EARNINGS PER SHARE

We compute basic earnings per common share by dividing net income attributable to Core Laboratories N.V. by the weighted average number of common shares outstanding during the period. Diluted earnings per common and potential common shares include additional shares in the weighted average share calculations associated with the incremental effect of dilutive restricted stock awards and contingently issuable shares, as determined using the treasury stock method. 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				Six Months Ended
	June 30,				June 30,
	2020		2019		2020		2019
Weighted average basic common shares      outstanding		44,470		44,354		44,459		44,339
Effect of dilutive securities:
Performance shares		—		357		—		394
Restricted stock		—		104		—		115
Weighted average diluted common and       potential common shares outstanding		44,470		44,815		44,459		44,848

For the three and six months ended June 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):

	Three months ended		Six months ended
	June 30, 2020		June 30, 2020
Performance shares		187		315
Restricted stock		51		60