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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2019
Earnings Per Share [Abstract]  
Computation of basic and diluted earnings per share
 
For the Three Months Ended 
 September 30,
 
For the Nine Months Ended 
 September 30,
 
2019
 
2018
 
2019
 
2018
Numerator (basic and diluted):
 
 
 
 
 
 
 
Net income
$
391,293

 
$
366,151

 
$
1,066,126

 
$
1,024,130

 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Weighted-average common shares outstanding – basic
76,172

 
80,593

 
77,415

 
81,939

Effect of stock options (1)
797

 
817

 
805

 
902

Weighted-average common shares outstanding – assuming dilution
76,969

 
81,410

 
78,220

 
82,841

 
 
 
 
 
 
 
 
Earnings per share:
 
 
 
 
 
 
 
Earnings per share-basic
$
5.14

 
$
4.54

 
$
13.77

 
$
12.50

Earnings per share-assuming dilution
$
5.08

 
$
4.50

 
$
13.63

 
$
12.36

 
 
 
 
 
 
 
 
Antidilutive potential common shares not included in the calculation of diluted earnings per share:
 
 
 
 
 
 
 
Stock options (1)
207

 
650

 
214

 
232

Weighted-average exercise price per share of antidilutive stock options (1)
$
360.80

 
$
264.65

 
$
360.36

 
$
268.22


(1) 
See Note 8 for further information concerning the terms of the Company’s share-based compensation plans.