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4. EARNINGS PER SHARE (Tables) | 9 Months Ended
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Sep. 30, 2013
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, net of common stock held in treasury, as follows (in thousands except share and per share data):
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Net (loss) income attributable to RadNet, Inc.'s common stockholders |  | $ | (467 | ) |  | $ | 5,053 |  |  | $ | 877 |  |  | $ | 7,888 |
BASIC NET (LOSS) INCOME PER SHARE ATTRIBUTABLE TO RADNET, INC.'S COMMON STOCKHOLDERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding during the period |  |  | 39,235,863 |  |  |  | 38,340,482 |  |  |  | 39,105,522 |  |  |  | 37,737,467 |
Basic net (loss) income per share attributable to RadNet, Inc.'s common stockholders |  | $ | (0.01 | ) |  | $ | 0.13 |  |  | $ | 0.02 |  |  | $ | 0.21 |
DILUTED NET (LOSS) INCOME PER SHARE ATTRIBUTABLE TO RADNET, INC.'S COMMON STOCKHOLDERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding during the period |  |  | 39,235,863 |  |  |  | 38,340,482 |  |  |  | 39,105,522 |  |  |  | 37,737,467 |
Add nonvested restricted stock subject only to service vesting |  |  | – |  |  |  | 560,000 |  |  |  | 311,419 |  |  |  | 516,655 |
Add additional shares issuable upon exercise of stock options and warrants |  |  | – |  |  |  | 960,203 |  |  |  | 469,199 |  |  |  | 990,177 |
Weighted average number of common shares used in calculating diluted net income per share |  |  | 39,235,863 |  |  |  | 39,860,685 |  |  |  | 39,886,140 |  |  |  | 39,244,299 |
Diluted net (loss) income per share attributable to RadNet, Inc.'s common stockholders |  | $ | (0.01 | ) |  | $ | 0.13 |  |  | $ | 0.02 |  |  | $ | 0.20 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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