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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Computation of basic and diluted earnings per share
 
For the Year Ended 
 December 31,
 
2014
 
2013
 
2012
Numerator (basic and diluted):
 
 
 
 
 
Net income
$
778,182

 
$
670,292

 
$
585,746

 
 
 
 
 
 
Denominator:
 
 
 
 
 
Denominator for basic earnings per share - weighted-average shares
104,262

 
109,244

 
121,182

Effect of stock options (1)
1,779

 
1,857

 
2,132

Denominator for diluted earnings per share - weighted-average shares
106,041

 
111,101

 
123,314

 
 
 
 
 
 
Earnings per share:
 
 
 
 
 
Earnings per share-basic
$
7.46

 
$
6.14

 
$
4.83

Earnings per share-assuming dilution
$
7.34

 
$
6.03

 
$
4.75

 
 
 
 
 
 
Antidilutive potential common shares not included in the calculation of diluted earnings per share:
 
 
 
 
 
Stock options (1)
363

 
498

 
1,816

Weighted-average exercise price per share of antidilutive stock options (1)
$
151.65

 
$
103.80

 
$
87.88


(1) 
See Note 9 for further discussion on the terms of the Company's share-based compensation plans.