Earnings per Share

9 Months Ended

Sep. 30, 2018

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		Nine Months Ended
	September 30,		September 30,
	2018	2017	2018	2017
Weighted average basic common shares outstanding	44,216	44,141	44,199	44,155
Effect of dilutive securities:
Performance shares	221	159	269	148
Restricted stock	154	32	145	32
Weighted average diluted common and potential common shares outstanding	44,591	44,332	44,613	44,335