Basic and Diluted Earnings per Share

12 Months Ended

Dec. 31, 2019

Earnings Per Share [Abstract]

Basic and Diluted Earnings per Share

NOTE 6. 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 RSUs. 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.

	Net earnings attributable to shareholders		Weighted average shares		Earnings per share
2019
Basic earnings attributable to shareholders	$	590,395		170,899	$	3.45
Effect of dilutive potential common shares		—		3,310		—
Diluted earnings attributable to shareholders	$	590,395		174,209	$	3.39
2018
Basic earnings attributable to shareholders	$	618,199		174,133	$	3.55
Effect of dilutive potential common shares		—		3,700		—
Diluted earnings attributable to shareholders	$	618,199		177,833	$	3.48
2017
Basic earnings attributable to shareholders	$	489,345		179,247	$	2.73
Effect of dilutive potential common shares		—		2,419		—
Diluted earnings attributable to shareholders	$	489,345		181,666	$	2.69

Substantially all outstanding potential common shares in 2019, 2018 and 2017 were dilutive.