11. 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 WA number of shares of common stock outstanding if the potentially dilutive securities had been issued. Potentially dilutive securities include unvested PSUs, RSUs, and outstanding stock options. The dilutive effect of potentially dilutive securities is reflected in diluted earnings per share 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
		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



		Net income	WA
		attributable to	number		Per share
Year ended December 31, 2017		stockholders	of shares		amount
Basic	$	75,027	107,044,348	$	0.70
Effect of dilutive securities:
Share units		(152)	353,880		-
Stock options		-	714,923		(0.01)
Diluted	$	74,875	108,113,151	$	0.69



		Net income	WA
		attributable to	number		Per share
Year ended December 31, 2016		stockholders	of shares		amount
Basic	$	91,832	106,630,323	$	0.86
Effect of dilutive securities:
Share units			91,997		-
Stock options		-	735,474		(0.01)
Diluted	$	91,832	107,457,794	$	0.85