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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
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,
 
2018
 
2017
 
2018
 
2017
Numerator (basic and diluted):
 
 
 
 
 
 
 
Net income
$
353,073

 
$
282,821

 
$
657,979

 
$
547,755

 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Weighted-average common shares outstanding – basic
81,733

 
90,030

 
82,624

 
91,012

Effect of stock options (1)
803

 
1,269

 
806

 
1,335

Weighted-average common shares outstanding – assuming dilution
82,536

 
91,299

 
83,430

 
92,347

 
 
 
 
 
 
 
 
Earnings per share:
 
 
 
 
 
 
 
Earnings per share-basic
$
4.32

 
$
3.14

 
$
7.96

 
$
6.02

Earnings per share-assuming dilution
$
4.28

 
$
3.10

 
$
7.89

 
$
5.93

 
 
 
 
 
 
 
 
Antidilutive potential common shares not included in the calculation of diluted earnings per share:
 
 
 
 
 
 
 
Stock options (1)
693

 
581

 
714

 
524

Weighted-average exercise price per share of antidilutive stock options (1)
$
261.11

 
$
262.25

 
$
260.39

 
$
265.02


(1) 
See Note 7 for further information concerning the terms of the Company’s share-based compensation plans.