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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2017
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,
 
2017
 
2016
 
2017
 
2016
Numerator (basic and diluted):
 
 
 
 
 
 
 
Net income
$
283,734

 
$
278,493

 
$
831,489

 
$
791,661

 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Weighted-average common shares outstanding – basic
86,947

 
94,891

 
89,641

 
95,994

Effect of stock options (1)
1,078

 
1,229

 
1,228

 
1,315

Weighted-average common shares outstanding – assuming dilution
88,025

 
96,120

 
90,869

 
97,309

 
 
 
 
 
 
 
 
Earnings per share:
 
 
 
 
 
 
 
Earnings per share-basic
$
3.26

 
$
2.93

 
$
9.28

 
$
8.25

Earnings per share-assuming dilution
$
3.22

 
$
2.90

 
$
9.15

 
$
8.14

 
 
 
 
 
 
 
 
Antidilutive potential common shares not included in the calculation of diluted earnings per share:
 
 
 
 
 
 
 
Stock options (1)
784

 
271

 
620

 
319

Weighted-average exercise price per share of antidilutive stock options (1)
$
246.65

 
$
267.66

 
$
258.75

 
$
264.88


(1) 
See Note 6 for further information concerning the terms of the Company’s share-based compensation plans.