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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Computation of basic and diluted earnings per share
 
For the Three Months Ended 
 June 30,
 
For the Six Months Ended 
 June 30,
 
2017
 
2016
 
2017
 
2016
Numerator (basic and diluted):
 
 
 
 
 
 
 
Net income
$
282,821

 
$
257,794

 
$
547,755

 
$
513,168

 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Weighted-average common shares outstanding – basic
90,030

 
95,967

 
91,012

 
96,554

Effect of stock options (1)
1,269

 
1,315

 
1,335

 
1,357

Weighted-average common shares outstanding – assuming dilution
91,299

 
97,282

 
92,347

 
97,911

 
 
 
 
 
 
 
 
Earnings per share:
 
 
 
 
 
 
 
Earnings per share-basic
$
3.14

 
$
2.69

 
$
6.02

 
$
5.31

Earnings per share-assuming dilution
$
3.10

 
$
2.65

 
$
5.93

 
$
5.24

 
 
 
 
 
 
 
 
Antidilutive potential common shares not included in the calculation of diluted earnings per share:
 
 
 
 
 
 
 
Stock options (1)
581

 
285

 
524

 
312

Weighted-average exercise price per share of antidilutive stock options (1)
$
262.25

 
$
262.49

 
$
265.02

 
$
259.46


(1) 
See Note 6 for further information concerning the terms of the Company’s share-based compensation plans.