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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Computation of basic and diluted earnings per share
 
For the Year Ended 
 December 31,
 
2018
 
2017
 
2016
Numerator (basic and diluted):
 
 
 
 
 
Net income
$
1,324,487

 
$
1,133,804

 
$
1,037,691

 
 
 
 
 
 
Denominator:
 
 
 
 
 
Weighted-average common shares outstanding – basic
81,406

 
88,426

 
95,447

Effect of stock options (1)
874

 
1,076

 
1,273

Weighted-average common shares outstanding – assuming dilution
82,280

 
89,502

 
96,720

 
 
 
 
 
 
Earnings per share:
 
 
 
 
 
Earnings per share-basic
$
16.27

 
$
12.82

 
$
10.87

Earnings per share-assuming dilution
$
16.10

 
$
12.67

 
$
10.73

 
 
 
 
 
 
Antidilutive potential common shares not included in the calculation of diluted earnings per share:
 
 
 
 
 
Stock options (1)
567

 
715

 
332

Weighted-average exercise price per share of antidilutive stock options (1)
$
268.55

 
$
252.16

 
$
265.77


(1) 
See Note 10 for further information concerning the terms of the Company’s share-based compensation plans.