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5. INVESTMENT IN JOINT VENTURES (Tables) | 9 Months Ended
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Sep. 30, 2013
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Investment in joint ventures | The following table is a roll forward of our investment in joint ventures during the nine months ended September 30, 2013 (in thousands):
Balance as of December 31, 2012 |  | $ | 28,598 |
Acquisition of a controlling interest in a joint venture (see Note 2) |  |  | (648 | )
Purchase of a 40% interest in a new joint venture (see Note 2) |  |  | 1,000 |
Equity contributions in existing joint ventures |  |  | 803 |
Equity earnings in these joint ventures |  |  | 4,481 |
Distribution of earnings |  |  | (5,624 | )
Balance as of September 30, 2013 |  | $ | 28,610 |
Key financial data in joint ventures | The following table is a summary of key financial data for these joint ventures as of September 30, 2013 and for the nine months ended September 30, 2013 and 2012 (in thousands):
Balance Sheet Data: |  | September 30, 2013 |
Current assets |  | $ | 15,521 |
Noncurrent assets |  |  | 49,361 |
Current liabilities |  |  | (6,995 | )
Noncurrent liabilities |  |  | (6,487 | )
Total net assets |  | $ | 51,400 |
Book value of Radnet joint venture interests |  | $ | 23,222 |
Cost in excess of book value of acquired joint venture interests |  |  | 5,059 |
Elimination of intercompany profit remaining on Radnet's consolidated balance sheet |  |  | 329 |
Total value of Radnet joint venture interests |  | $ | 28,610 |
Total book value of other joint venture partner interests |  | $ | 28,178 |
Income Statement Data for the nine months ended September 30, |  |  | 2013 |  |  |  | 2012 |
Net revenue |  | $ | 68,912 |  |  | $ | 60,954 |
Net income |  | $ | 9,819 |  |  | $ | 9,011 |

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- Definition The entire disclosure for investments accounted for under the cost-method. The carrying amount of such investments may be adjusted, for example, distributions in excess of cost (return of capital) or for other-than-temporary impairments. The cost method and lower-of-cost or market, an adaptation of the cost method, is generally followed for most investments in noncontrolled corporations, in some corporate joint ventures, and to a lesser extent in unconsolidated subsidiaries in which the entity does not have the ability to exercise significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 + Details
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