Basic and Diluted Earnings per Share

6 Months Ended

Jun. 30, 2021

Note 4. Basic and Diluted Earnings per Share

Diluted earnings attributable to shareholders per share is computed using the weighted average number of common shares and dilutive potential common shares outstanding. Dilutive potential shares represent outstanding stock options, including purchase options under the Company's employee stock purchase plan, and unvested restricted stock units. Basic earnings attributable to shareholders per share is calculated using the weighted average number of common shares outstanding without taking into consideration dilutive potential common shares outstanding.

The following table reconciles the numerator and the denominator of the basic and diluted per share computations for earnings attributable to shareholders:

	Three months ended June 30,
	Net earnings attributable to shareholders		Weighted average shares		Earnings per share
2021
Basic earnings attributable to shareholders	$	316,372		169,210	$	1.87
Effect of dilutive potential common shares		—		2,467		—
Diluted earnings attributable to shareholders	$	316,372		171,677	$	1.84
2020
Basic earnings attributable to shareholders	$	183,869		166,767	$	1.10
Effect of dilutive potential common shares		—		2,523		—
Diluted earnings attributable to shareholders	$	183,869		169,290	$	1.09

	Six months ended June 30,
	Net earnings attributable to shareholders		Weighted average shares		Earnings per share
2021
Basic earnings attributable to shareholders	$	603,592		169,140	$	3.57
Effect of dilutive potential common shares		—		2,520		—
Diluted earnings attributable to shareholders	$	603,592		171,660	$	3.52
2020
Basic earnings attributable to shareholders	$	306,213		167,751	$	1.83
Effect of dilutive potential common shares		—		2,631		—
Diluted earnings attributable to shareholders	$	306,213		170,382	$	1.80

Substantially all outstanding potential common shares as of June 30, 2021 and 2020 were dilutive.