Earnings Per Share

3 Months Ended

Mar. 31, 2020

Earnings Per Share

Earnings Per Share

12. Earnings Per Share

Basic net income per share is calculated by dividing the net income attributable to common shares by the weighted-average number of common shares outstanding during the period. Diluted net income per share adjusts basic net income per share for the effects of potentially dilutive common shares, if the effect is not antidilutive. Potentially dilutive common stock consists of shares issuable under the 2010 Plan.

The following is a summary of basic and diluted net income per share (in thousands, except share and per share amounts):

	Three Months Ended March 31,
	2020		2019
Net income attributable to common shares	$	17,848	$	19,661
Weighted-average common shares outstanding - basic		37,335,892		36,347,781
Effect of potentially dilutive common shares:
Stock options		25,298		38,921
Unvested awards		143,159		160,363
Weighted-average common shares outstanding - diluted		37,504,349		36,547,065
Net income per share attributable to common shares
Basic	$	0.48	$	0.54
Diluted	$	0.48	$	0.54

In the calculations above, we have excluded weighted-average potentially dilutive securities of 2,054 and 39,754 for the three months ended March 31, 2020, and 2019, respectively, as their effect would have been antidilutive.