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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2019
Earnings Per Share [Abstract]  
Computation of basic and diluted earnings per share
 
For the Three Months Ended 
 June 30,
 
For the Six Months Ended 
 June 30,
 
2019
 
2018
 
2019
 
2018
Numerator (basic and diluted):
 
 
 
 
 
 
 
Net income
$
353,681

 
$
353,073

 
$
674,833

 
$
657,979

 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Weighted-average common shares outstanding – basic
77,613

 
81,733

 
78,047

 
82,624

Effect of stock options (1)
799

 
803

 
807

 
806

Weighted-average common shares outstanding – assuming dilution
78,412

 
82,536

 
78,854

 
83,430

 
 
 
 
 
 
 
 
Earnings per share:
 
 
 
 
 
 
 
Earnings per share-basic
$
4.56

 
$
4.32

 
$
8.65

 
$
7.96

Earnings per share-assuming dilution
$
4.51

 
$
4.28

 
$
8.56

 
$
7.89

 
 
 
 
 
 
 
 
Antidilutive potential common shares not included in the calculation of diluted earnings per share:
 
 
 
 
 
 
 
Stock options (1)
184

 
693

 
188

 
714

Weighted-average exercise price per share of antidilutive stock options (1)
$
357.18

 
$
261.11

 
$
357.33

 
$
260.39


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