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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2014
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,
 
2014
 
2013
 
2014
 
2013
Numerator (basic and diluted):
 
 
 
 
 
 
 
Net income
$
216,997

 
$
186,489

 
$
596,504

 
$
517,945

 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Denominator for basic earnings per share - weighted-average shares
103,498

 
108,307

 
105,146

 
110,034

Effect of stock options (1)
1,724

 
1,886

 
1,799

 
1,851

Denominator for diluted earnings per share - weighted-average shares
105,222

 
110,193

 
106,945

 
111,885

 
 
 
 
 
 
 
 
Earnings per share:
 
 
 
 
 
 
 
Earnings per share-basic
$
2.10

 
$
1.72

 
$
5.67

 
$
4.71

Earnings per share-assuming dilution
$
2.06

 
$
1.69

 
$
5.58

 
$
4.63

 
 
 
 
 
 
 
 
Antidilutive potential common shares not included in the calculation of diluted earnings per share:
 
 
 
 
 
 
 
Stock options (1)
257

 
190

 
328

 
639

Weighted-average exercise price per share of antidilutive stock options (1)
$
141.77

 
$
106.40

 
$
139.13

 
$
98.77


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