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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2014
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,
 
2014
 
2013
 
2014
 
2013
Numerator (basic and diluted):
 
 
 
 
 
 
 
Net income
$
205,647

 
$
177,127

 
$
379,507

 
$
331,456

 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Denominator for basic earnings per share - weighted-average shares
105,772

 
110,278

 
105,982

 
110,914

Effect of stock options (1)
1,784

 
1,801

 
1,835

 
1,822

Denominator for diluted earnings per share - weighted-average shares
107,556

 
112,079

 
107,817

 
112,736

 
 
 
 
 
 
 
 
Earnings per share:
 
 
 
 
 
 
 
Earnings per share-basic
$
1.94

 
$
1.61

 
$
3.58

 
$
2.99

Earnings per share-assuming dilution
$
1.91

 
$
1.58

 
$
3.52

 
$
2.94

 
 
 
 
 
 
 
 
Antidilutive potential common shares not included in the calculation of diluted earnings per share:
 
 
 
 
 
 
 
Stock options (1)
305

 
784

 
336

 
1,182

Weighted-average exercise price per share of antidilutive stock options (1)
$
137.82

 
$
96.38

 
$
137.35

 
$
93.57


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