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4. EARNINGS PER SHARE
 9 Months Ended
Sep. 30, 2016
Earnings Per Share [Abstract]  
EARNINGS PER SHARE

Earnings per share is based upon the weighted average number of shares of common stock and common stock equivalents outstanding, as follows (in thousands except share and per share data):

 

   Three Months Ended   Nine Months Ended 
   September 30,   September 30, 
   2016   2015   2016   2015 
                 
Net income attributable to RadNet, Inc.'s common stockholders  $1,647   $7,987   $3,549   $6,828 
                     
BASIC NET INCOME PER SHARE ATTRIBUTABLE TO RADNET, INC.'S COMMON STOCKHOLDERS                    
Weighted average number of common shares outstanding during the period   45,868,629    43,637,022    46,337,993    43,247,002 
Basic net income per share attributable to RadNet, Inc.'s common stockholders  $0.04   $0.18   $0.08   $0.16 
                     
DILUTED NET INCOME PER SHARE ATTRIBUTABLE TO RADNET, INC.'S COMMON STOCKHOLDERS                    
Weighted average number of common shares outstanding during the period   45,868,629    43,637,022    46,337,993    43,247,002 
Add nonvested restricted stock subject only to service vesting   260,389    437,689    190,428    484,810 
Add additional shares issuable upon exercise of stock options and warrants   204,952    677,225    220,415    972,511 
Weighted average number of common shares used in calculating diluted net income per share   46,333,970    44,751,936    46,748,836    44,704,323 
Diluted net income per share attributable to RadNet, Inc.'s common stockholders  $0.04   $0.18   $0.08   $0.15