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5. INVESTMENT IN JOINT VENTURES (Tables) | 6 Months Ended
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Jun. 30, 2013
Equity Method Investments and Joint Ventures [Abstract] |
Roll forward of investment in joint ventures |
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 |  |  | 2,864 |
Distribution of earnings |  |  | (3,971 | )
Balance as of June 30, 2013 |  | $ | 28,646 |
Key financial data in joint ventures |
Balance Sheet Data: |  | June 30, 2013 |  |  |  |
Current assets |  | $ | 14,802 |  |  |  |  |
Noncurrent assets |  |  | 49,216 |  |  |  |  |
Current liabilities |  |  | (6,995 | ) |  |  |  |
Noncurrent liabilities |  |  | (6,286 | ) |  |  |  |
Total net assets |  | $ | 50,737 |  |  |  |  |
Book value of Radnet joint venture interests |  | $ | 22,880 |  |  |  |  |
Cost in excess of book value of acquired joint venture interests |  |  | 5,273 |  |  |  |  |
Elimination of intercompany profit remaining on Radnet's consolidated balance sheet |  |  | 493 |  |  |  |  |
Total value of Radnet joint venture interests |  | $ | 28,646 |  |  |  |  |
Total book value of other joint venture partner interests |  | $ | 27,857 |  |  |  |  |
Income Statement Data for the six months ended June 30, |  |  | 2013 |  |  |  | 2012 |
Net revenue |  | $ | 45,209 |  |  | $ | 41,955 |
Net income |  | $ | 5,952 |  |  | $ | 7,016 |

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