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6. INVESTMENT IN JOINT VENTURES (Details-Key financial data) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Key financial data for joint ventures      
Current assets - joint ventures $ 33,452   $ 28,186
Noncurrent assets - joint ventures 96,766   91,660
Current liabilities - joint ventures (9,786)   (15,258)
Noncurrent liabilities - joint ventures (42,633)   (44,059)
Total net assets -joint ventures 77,799   60,529
Book value of Radnet joint venture interests 36,873   28,397
Cost in excess of book value of acquired joint venture interests 4,995   4,970
Elimination of intercompany profit     217
Total value of Radnet joint venture interests 41,868   33,584
Total book value of other joint venture partner interests 40,926   $ 32,132
Net revenue 119,920 $ 85,305  
Net income $ 18,001 $ 13,489