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Earnings Per Share
 12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Earnings Per Share
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 RSUs and stock options 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,
 
2015
 
2014
 
2013
Net Income
$
423,223

 
$
381,519

 
$
311,623

Denominator for basic earnings per share—Weighted-average shares outstanding
304,722

 
302,343

 
299,574

Effect of dilutive securities:
 
 
 
 
 
RSUs
667

 
791

 
845

Stock options
2,107

 
2,905

 
3,696

Restricted stock
—

 
6

 
16

Denominator for diluted earnings per share—Adjusted weighted-average shares outstanding
307,496

 
306,045

 
304,131

Earnings per share, basic
$
1.39

 
$
1.26

 
$
1.04

Earnings per share, diluted
$
1.38

 
$
1.25

 
$
1.02

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,
 
2015
 
2014
 
2013
Antidilutive securities:
 
 
 
 
 
RSUs
230

 
289

 
—

Stock options
96

 
116

 
—