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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Computation of basic and diluted earnings per share
 
For the Year Ended 
 December 31,
 
2015
 
2014
 
2013
Numerator (basic and diluted):
 
 
 
 
 
Net income
$
931,216

 
$
778,182

 
$
670,292

 
 
 
 
 
 
Denominator:
 
 
 
 
 
Weighted-average common shares outstanding – basic
99,965

 
104,262

 
109,244

Effect of stock options (1)
1,549

 
1,779

 
1,857

Weighted-average common shares outstanding – assuming dilution
101,514

 
106,041

 
111,101

 
 
 
 
 
 
Earnings per share:
 
 
 
 
 
Earnings per share-basic
$
9.32

 
$
7.46

 
$
6.14

Earnings per share-assuming dilution
$
9.17

 
$
7.34

 
$
6.03

 
 
 
 
 
 
Antidilutive potential common shares not included in the calculation of diluted earnings per share:
 
 
 
 
 
Stock options (1)
245

 
363

 
498

Weighted-average exercise price per share of antidilutive stock options (1)
$
216.29

 
$
151.65

 
$
103.80


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