Earnings per share attributable to stockholders

12 Months Ended

Dec. 31, 2020

Earnings per share attributable to stockholders

Earnings per share attributable to stockholders

10.   Earnings per share attributable to stockholders

Basic earnings per share (“EPS”) attributable to stockholders was calculated by dividing the net income attributable to stockholders by the weighted average (“WA”) number of common shares outstanding during the period. Diluted EPS attributable to stockholders was calculated by dividing the net income attributable to stockholders by the weighted average number of shares of common stock outstanding if the potentially dilutive securities had been issued. Potentially dilutive securities include unvested PSUs, unvested RSUs, and outstanding stock options. The dilutive effect of potentially dilutive securities is reflected in diluted EPS by application of the treasury stock method. Under the treasury stock method, an increase in the fair market value of the Company’s common stock can result in a greater dilutive effect from potentially dilutive securities.

	Net income		WA	Per
	attributable to		number	share
Year ended December 31, 2020	stockholders		of shares	amount
Basic	$	170,095	109,054,493	$	1.56
Effect of dilutive securities:
Share units		—	541,054		(0.01)
Stock options		—	715,437		(0.01)
Diluted	$	170,095	110,310,984	$	1.54

	Net income		WA	Per
	attributable to		number	share
Year ended December 31, 2019	stockholders		of shares	amount
Basic	$	149,039	108,519,739	$	1.37
Effect of dilutive securities:
Share units		—	458,763		—
Stock options		—	780,621		(0.01)
Diluted	$	149,039	109,759,123	$	1.36

	Net income		WA
	attributable to		number	Per share
Year ended December 31, 2018	stockholders		of shares	amount
Basic	$	121,479	108,063,349	$	1.12
Effect of dilutive securities:
Share units		—	459,503		—
Stock options		—	865,384		(0.01)
Diluted	$	121,479	109,388,236	$	1.11