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Earnings Per Share
12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Earnings Per Share EARNINGS PER SHARE
Basic earnings per share is computed by dividing net income attributable to Republic Services, Inc. by the weighted average number of common shares (including vested but unissued RSUs) outstanding during the period. Diluted earnings per share is based on the combined weighted average number of common shares and common share equivalents outstanding, which include, where appropriate, the assumed exercise of employee stock options, unvested RSUs and unvested PSUs at the expected attainment levels. We use the treasury stock method in computing diluted earnings per share.
Earnings per share for the years ended December 31, 2018, 2017, and 2016 are calculated as follows (in thousands, except per share amounts):
 
2018
 
2017
 
2016
Basic earnings per share:
 
 
 
 
 
Net income attributable to Republic Services, Inc.
$
1,036,898

 
$
1,278,374

 
$
612,588

Weighted average common shares outstanding
326,897

 
337,051

 
343,024

Basic earnings per share
$
3.17

 
$
3.79

 
$
1.79

Diluted earnings per share:
 
 
 
 
 
Net income attributable to Republic Services, Inc.
$
1,036,898

 
$
1,278,374

 
$
612,588

Weighted average common shares outstanding
326,897

 
337,051

 
343,024

Effect of dilutive securities:
 
 
 
 
 
Options to purchase common stock
745

 
1,246

 
1,076

Unvested RSU awards
250

 
346

 
190

Unvested PSU awards
491

 
338

 
100

Weighted average common and common equivalent shares outstanding
328,383

 
338,981

 
344,390

Diluted earnings per share
$
3.16

 
$
3.77

 
$
1.78


There were no antidilutive securities during the years ended December 31, 2018, 2017, and 2016.