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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2015
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,
 
2015
 
2014
 
2015
 
2014
Numerator (basic and diluted):
 
 
 
 
 
 
 
Net income
$
266,268

 
$
216,997

 
$
712,640

 
$
596,504

 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Weighted-average common shares outstanding – basic
99,270

 
103,498

 
100,468

 
105,146

Effect of stock options (1)
1,500

 
1,724

 
1,573

 
1,799

Weighted-average common shares outstanding – assuming dilution
100,770

 
105,222

 
102,041

 
106,945

 
 
 
 
 
 
 
 
Earnings per share:
 
 
 
 
 
 
 
Earnings per share-basic
$
2.68

 
$
2.10

 
$
7.09

 
$
5.67

Earnings per share-assuming dilution
$
2.64

 
$
2.06

 
$
6.98

 
$
5.58

 
 
 
 
 
 
 
 
Antidilutive potential common shares not included in the calculation of diluted earnings per share:
 
 
 
 
 
 
 
Stock options (1)
176

 
257

 
256

 
328

Weighted-average exercise price per share of antidilutive stock options (1)
$
218.21

 
$
141.77

 
$
210.49

 
$
139.13


(1) 
See Note 6 for further discussion on the terms of the Company's share-based compensation plans.