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4. EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Earning Per Share |  |  |  |
Net Income attributable to Radnet, Inc.'s common stockholders | $ 5,053 | $ 39 | $ 7,888 | $ 2,684
Weighted average number of common shares outstanding during the year | 38,340,482 | 37,426,460 | 37,737,467 | 37,347,946
Basic income per share attributable to Radnet, Inc.'s common stockholders | $ 0.13 | $ 0.00 | $ 0.21 | $ 0.07
Weighted average number of Common Shares outstanding during the year | 38,340,482 | 37,426,460 | 37,737,467 | 37,347,946
Nonvested restricted stock subject only to service vesting | 560,000 |  | 516,655 |
Additional shares issuable upon exercise of stock options and warrants | 960,203 | 1,043,513 | 990,177 | 1,731,052
Weighted average number of common shares used in calculating diluted income per share | 39,860,685 | 38,469,973 | 39,244,299 | 39,078,998
Diluted income per share attributable to RadNet, Inc.'s common stockholders | $ 0.13 | $ 0.00 | $ 0.2 | $ 0.07

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