Basic and Diluted Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

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
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
2016
Basic earnings attributable to shareholders	$	430,807	181,282	$	2.38
Effect of dilutive potential common shares	—		1,422	—
Diluted earnings attributable to shareholders	$	430,807	182,704	$	2.36
2015
Basic earnings attributable to shareholders	$	457,223	188,941	$	2.42
Effect of dilutive potential common shares	—		1,282	—
Diluted earnings attributable to shareholders	$	457,223	190,223	$	2.40

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following potential common shares have been excluded from the computation of diluted earnings per share because the effect would have been antidilutive:

Years ended December 31,	2017	2016	2015
Shares	19	9,211	8,330