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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2016
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,
 
2016
 
2015
 
2016
 
2015
Numerator (basic and diluted):
 
 
 
 
 
 
 
Net income
$
278,493

 
$
266,268

 
$
791,661

 
$
712,640

 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Weighted-average common shares outstanding – basic
94,891

 
99,270

 
95,994

 
100,468

Effect of stock options (1)
1,229

 
1,500

 
1,315

 
1,573

Weighted-average common shares outstanding – assuming dilution
96,120

 
100,770

 
97,309

 
102,041

 
 
 
 
 
 
 
 
Earnings per share:
 
 
 
 
 
 
 
Earnings per share-basic
$
2.93

 
$
2.68

 
$
8.25

 
$
7.09

Earnings per share-assuming dilution
$
2.90

 
$
2.64

 
$
8.14

 
$
6.98

 
 
 
 
 
 
 
 
Antidilutive potential common shares not included in the calculation of diluted earnings per share:
 
 
 
 
 
 
 
Stock options (1)
271

 
176

 
319

 
256

Weighted-average exercise price per share of antidilutive stock options (1)
$
267.66

 
$
218.21

 
$
264.88

 
$
210.49


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