v2.4.0.8
Earnings Per Share
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Earnings Per Share [Abstract]    
Earnings Per Share
Earnings Per Share
The following chart sets forth the computation of earnings per share (in thousands, except per share amounts):
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2013
 
2012
 
2013
 
2012
Net income
$
73,445

 
$
54,048

 
$
233,759

 
$
199,037

Denominator for basic earnings per share—weighted average shares outstanding
300,223

 
296,437

 
299,213

 
295,338

Effect of dilutive securities:
 
 
 
 
 
 
 
RSUs
883

 
430

 
775

 
436

Stock options
3,564

 
4,241

 
3,765

 
4,398

Restricted stock
15

 
64

 
18

 
54

Denominator for diluted earnings per share—Adjusted weighted average shares outstanding
304,685

 
301,172

 
303,771

 
300,226

Earnings per share, basic
$
0.24

 
$
0.18

 
$
0.78

 
$
0.67

Earnings per share, diluted
$
0.24

 
$
0.18

 
$
0.77

 
$
0.66


There were no employee stock-based compensation awards that would have had an antidilutive effect on the computation of diluted earnings per share for the three and nine months ended September 30, 2013 or September 30, 2012.
Earnings Per Share
Basic earnings per share are computed using the weighted average number of common shares outstanding during the period. Diluted earnings per share incorporate the incremental shares issuable upon the assumed exercise of stock options and the assumed vesting of RSUs and restricted stock. Certain of our stock options and restricted stock were excluded from the calculation of diluted earnings per share because they were antidilutive, but these equity instruments could be dilutive in the future.
The following chart sets forth the computation of earnings per share (in thousands, except per share amounts):
 
Year Ended December 31,
 
2012
 
2011
 
2010
Income from continuing operations
$
261,225

 
$
210,264

 
$
167,118

Denominator for basic earnings per share—Weighted-average shares outstanding
295,810

 
292,252

 
286,542

Effect of dilutive securities:
 
 
 
 
 
RSUs
479

 
182

 
—

Stock options
4,346

 
4,250

 
5,118

Restricted stock
58

 
66

 
54

Denominator for diluted earnings per share—Adjusted weighted-average shares outstanding
300,693

 
296,750

 
291,714

Basic earnings per share from continuing operations
$
0.88

 
$
0.72

 
$
0.58

Diluted earnings per share from continuing operations
$
0.87

 
$
0.71

 
$
0.57


The following table sets forth the number of employee stock-based compensation awards outstanding but not included in the computation of diluted earnings per share because their effect would have been antidilutive (in thousands):
 
Year Ended December 31,
 
2012
 
2011
 
2010
Antidilutive securities:
 
 
 
 
 
Stock options
—

 
2,340

 
5,714

Restricted stock
—

 
—

 
80