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Earnings Per Share
 12 Months Ended
Dec. 31, 2013
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):
 
Year Ended December 31,
 
2013
 
2012
 
2011
Net income for basic and diluted earnings per share
$
473,692

 
$
18,287

 
$
607,421

Weighted-average common shares outstanding
219,638

 
217,930

 
216,983

Dilutive effect of stock options, performance share awards and restricted stock awards
1,303

 
1,527

 
2,246

Diluted weighted-average shares outstanding
220,941

 
219,457

 
219,229

Basic earnings per share:
 
 
 
 
 
Net income
$
2.16

 
$
0.08

 
$
2.80

Diluted earnings per share:
 
 
 
 
 
Net income
$
2.14

 
$
0.08

 
$
2.77


Diluted earnings per share did not reflect options to purchase an aggregate of 1.9 million, 3.1 million and 2.8 million shares for each of the years ended December 31, 2013, 2012 and 2011, respectively, because the effect of including them would have been antidilutive.