6. INVESTMENT IN JOINT VENTURES (Details-Key financial data) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Key financial data for joint ventures
Current assets - joint ventures	$ 18,987
Noncurrent assets - joint ventures	48,583
Current liabilities - joint ventures	(8,501)
Noncurrent liabilities - joint ventures	(5,144)
Total net assets -joint ventures	53,925
Book value of Radnet joint venture interests	25,532
Cost in excess of book value of acquired joint venture interests	4,970
Total value of Radnet joint venture interests	30,502		$ 32,123
Total book value of other joint venture partner interests	28,393
Net revenue	56,639	$ 48,835
Net income	$ 9,476	$ 5,738