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4. EARNINGS PER SHARE | 6 Months Ended
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Jun. 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 |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Net income attributable to RadNet, Inc.'s common stockholders |  | $ | 2,686 |  |  | $ | 2,946 |  |  | $ | 1,344 |  |  | $ | 2,835 |
BASIC NET INCOME PER SHARE ATTRIBUTABLE TO RADNET, INC.'S COMMON STOCKHOLDERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding during the period |  |  | 39,217,122 |  |  |  | 37,761,316 |  |  |  | 39,038,904 |  |  |  | 37,715,723 |
Basic net income per share attributable to RadNet, Inc.'s common stockholders |  | $ | 0.07 |  |  | $ | 0.08 |  |  | $ | 0.03 |  |  | $ | 0.08 |
DILUTED NET INCOME PER SHARE ATTRIBUTABLE TO RADNET, INC.'S COMMON STOCKHOLDERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding during the period |  |  | 39,217,122 |  |  |  | 37,761,316 |  |  |  | 39,038,904 |  |  |  | 37,715,723 |
Add nonvested restricted stock subject only to service vesting |  |  | 302,799 |  |  |  | 521,667 |  |  |  | 302,438 |  |  |  | 494,744 |
Add additional shares issuable upon exercise of stock options and warrants |  |  | 309,742 |  |  |  | 1,147,733 |  |  |  | 511,956 |  |  |  | 1,005,165 |
Weighted average number of common shares used in calculating diluted net income per share |  |  | 39,829,663 |  |  |  | 39,430,716 |  |  |  | 39,853,298 |  |  |  | 39,215,632 |
Diluted net income per share attributable to RadNet, Inc.'s common stockholders |  | $ | 0.07 |  |  | $ | 0.07 |  |  | $ | 0.03 |  |  | $ | 0.07 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=16381557&loc=d3e4984-109258 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 + Details
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