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5. INVESTMENT IN JOINT VENTURES (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012
Key financial data for joint ventures |  |
Current assets - joint ventures | $ 15,277 |
Noncurrent assets - joint ventures | 44,169 |
Current liabilities - joint ventures | (5,537) |
Noncurrent liabilities - joint ventures | (5,871) |
Total net assets -joint ventures | 48,038 |
Book value of Radnet joint venture interests | 22,422 |
Cost in excess of book value of acquired joint venture interests | 5,232 |
Elimination of intercompany profit remaining on Radnet's consolidated balance sheet | 305 |
Total value of Radnet joint venture interests | 27,959 |
Total book value of other joint venture partner interests | 25,616 |
Net revenue | 22,281 | 21,076
Net income | $ 2,733 | $ 2,533

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