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4. EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Earnings Per Share [Abstract] |  |  |  |
Net income (loss) attributable to RadNet, Inc.'s common stockholders | $ 5,144 | $ 2,686 | $ (7,280) | $ 1,344
BASIC NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO RADNET, INC.'S COMMON STOCKHOLDERS |  |  |  |
Weighted average number of common shares outstanding during the period | 40,817,333 | 39,217,122 | 40,413,863 | 39,038,904
Basic net income (loss) per share attributable to RadNet, Inc.'s common stockholders | $ 0.13 | $ 0.07 | $ (0.18) | $ 0.03
DILUTED NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO RADNET, INC.'S COMMON STOCKHOLDERS |  |  |  |
Weighted average number of common shares outstanding during the period | 40,817,333 | 39,217,122 | 40,413,863 | 39,038,904
Add nonvested restricted stock subject only to service vesting | 1,019,930 | 302,799 | 0 | 302,438
Add additional shares issuable upon exercise of stock options and warrants | 1,425,732 | 309,742 | 0 | 511,956
Weighted average number of common shares used in calculating diluted net income per share | 43,262,995 | 39,829,663 | 40,413,863 | 39,853,298
Diluted net income (loss) per share attributable to RadNet, Inc.'s common stockholders | $ 0.12 | $ 0.07 | $ (0.18) | $ 0.03

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