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Earnings Per Share
 9 Months Ended
Sep. 30, 2014
Earnings Per Share [Abstract]  
Earnings Per Share
Earnings Per Share
 
A reconciliation between basic and diluted earnings per share is as follows (in thousands, except per share data):
 
 
Quarter Ended September 30,
 
Nine Months Ended September 30,
 
2014
 
2013
 
2014
 
2013
Net income for basic and diluted earnings per share
$
490,248

 
$
365,701

 
$
654,378

 
$
466,674

Weighted-average common shares outstanding
222,523

 
219,744

 
222,007

 
219,450

Dilutive effect of stock options, performance share awards and restricted stock awards
1,336

 
1,260

 
1,344

 
1,294

Diluted weighted-average shares outstanding
223,859

 
221,004

 
223,351

 
220,744

Basic earnings per share
$
2.20

 
$
1.66

 
$
2.95

 
$
2.13

Diluted earnings per share
$
2.19

 
$
1.65

 
$
2.93

 
$
2.11


 
Diluted earnings per share does not reflect options to purchase an aggregate of 2.2 million shares for each of the quarter and nine months ended September 30, 2013, respectively, because the effect of including them would have been antidilutive. There were no antidilutive shares for the quarter and nine months ended September 30, 2014.