Earnings per Share

6 Months Ended

Jun. 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		Six Months Ended
	June 30,		June 30,
	2018	2017	2018	2017
Weighted average basic common shares outstanding	44,203	44,164	44,191	44,162
Effect of dilutive securities:
Performance shares	205	148	255	143
Restricted stock	85	62	69	55
Weighted average diluted common and potential common shares outstanding	44,493	44,374	44,515	44,360