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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2015
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,
 
2015
 
2014
 
2015
 
2014
Numerator (basic and diluted):
 
 
 
 
 
 
 
Net income
$
233,508

 
$
205,647

 
$
446,372

 
$
379,507

 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Denominator for basic earnings per share - weighted-average shares
100,547

 
105,772

 
101,078

 
105,982

Effect of stock options (1)
1,562

 
1,784

 
1,606

 
1,835

Denominator for diluted earnings per share - weighted-average shares
102,109

 
107,556

 
102,684

 
107,817

 
 
 
 
 
 
 
 
Earnings per share:
 
 
 
 
 
 
 
Earnings per share-basic
$
2.32

 
$
1.94

 
$
4.42

 
$
3.58

Earnings per share-assuming dilution
$
2.29

 
$
1.91

 
$
4.35

 
$
3.52

 
 
 
 
 
 
 
 
Antidilutive potential common shares not included in the calculation of diluted earnings per share:
 
 
 
 
 
 
 
Stock options (1)
226

 
305

 
312

 
336

Weighted-average exercise price per share of antidilutive stock options (1)
$
206.72

 
$
137.82

 
$
200.65

 
$
137.35


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