Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Computation of basic and diluted earnings per share

	For the Three Months Ended   March 31,
	2019		2018
Numerator (basic and diluted):
Net income	$	321,152	$	304,906
Denominator:
Weighted-average common shares outstanding – basic	78,484		83,530
Effect of stock options (1)	813		993
Weighted-average common shares outstanding – assuming dilution	79,297		84,523
Earnings per share:
Earnings per share-basic	$	4.09	$	3.65
Earnings per share-assuming dilution	$	4.05	$	3.61
Antidilutive potential common shares not included in the calculation of diluted earnings per share:
Stock options (1)	176		761
Weighted-average exercise price per share of antidilutive stock options (1)	$	347.98	$	259.28

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See Note 8 for further information concerning the terms of the Company’s share-based compensation plans.