Earnings per share attributable to stockholders (Tables)

6 Months Ended

Jun. 30, 2022

Earnings per share attributable to stockholders

Computation of Basic and Diluted Earnings Per Share

	Three months ended					Six months ended
	June 30, 2022					June 30, 2022
	Net income		WA	Per		Net income		WA	Per
	attributable to		number	share		attributable to		number	share
	stockholders		of shares	amount		stockholders		of shares	amount
Basic	$	53,365	110,760,339	$	0.48	$	231,459	110,705,182	$	2.09
Effect of dilutive securities:
Share units		—	397,274		—		—	423,767		(0.01)
Stock options		—	547,489		—		—	552,695		(0.01)
Diluted	$	53,365	111,705,102	$	0.48	$	231,459	111,681,644	$	2.07

	Three months ended					Six months ended
	June 30, 2021					June 30, 2021
	Net income		WA	Per		Net income		WA	Per
	attributable to		number	share		attributable to		number	share
	stockholders		of shares	amount		stockholders		of shares	amount
Basic	$	60,749	110,311,615	$	0.55	$	88,937	110,144,229	$	0.81
Effect of dilutive securities:
Share units		—	322,371		—		—	450,752		—
Stock options		—	700,198		—		—	707,730		(0.01)
Diluted	$	60,749	111,334,184	$	0.55	$	88,937	111,302,711	$	0.80