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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2016
Earnings Per Share [Abstract]  
Computation of basic and diluted earnings per share
 
For the Year Ended 
 December 31,
 
2016
 
2015
 
2014
Numerator (basic and diluted):
 
 
 
 
 
Net income
$
1,037,691

 
$
931,216

 
$
778,182

 
 
 
 
 
 
Denominator:
 
 
 
 
 
Weighted-average common shares outstanding – basic
95,447

 
99,965

 
104,262

Effect of stock options (1)
1,273

 
1,549

 
1,779

Weighted-average common shares outstanding – assuming dilution
96,720

 
101,514

 
106,041

 
 
 
 
 
 
Earnings per share:
 
 
 
 
 
Earnings per share-basic
$
10.87

 
$
9.32

 
$
7.46

Earnings per share-assuming dilution
$
10.73

 
$
9.17

 
$
7.34

 
 
 
 
 
 
Antidilutive potential common shares not included in the calculation of diluted earnings per share:
 
 
 
 
 
Stock options (1)
332

 
245

 
363

Weighted-average exercise price per share of antidilutive stock options (1)
$
265.77

 
$
216.29

 
$
151.65


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