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4. FACILITY ACQUISITIONS, ASSETS HELD FOR SALE AND DISPOSITIONS (Details Narrative) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Common stock issued for acquisition $ 2,500   $ 9,241
Goodwill acquired 256,776 $ 239,553 239,408
Proceeds from sale of business 8,429 0 35,500
Severance costs 1,821 2,877 $ 745
Joint Venture [Member] | Park West [Member]      
Payments to acquire business   $ 1,200  
Non-controlling interest percenatge   47.60%  
Ownership percentage   100.00% 52.40%
Advanced Imaging at Timonium [Member]      
Proceeds from sale of business 3,900    
Proceeds in excess of book value 2,800    
Transfer of fixed assets to new joint venture 1,100    
Rhode Island Medical Imaging, Inc [Member]      
Proceeds from sale of business 4,500    
Gain on sale of investment 1,900    
West Valley Imaging Center [Member]      
Proceeds from sale of business 5,900    
Proceeds in excess of book value 1,800    
Transfer of fixed assets to new joint venture 3,000    
Oncology practices [Member]      
Proceeds from sale of business 1,200    
Gain on sale of investment 361    
RadSite, LLC [Member]      
Payments to acquire business 856    
Common stock issued for acquisition 1,000    
Fixed assets acquired 91    
Current assets acquired 25    
Liabilities acquired 75    
Intangible assets acquired 150    
Remote Diagnostic Imaging P.L.L.C. [Member]      
Consideration transferred 3,900    
Fixed assets acquired 2,600    
Goodwill acquired 1,200    
Intangible assets acquired 50    
Diagnostic Imaging Associates [Member]      
Payments to acquire business 13,000    
Common stock issued for acquisition 1,500    
Fixed assets acquired 3,100    
Current assets acquired 1,200    
Goodwill acquired 10,200    
Stockton MRI, Inc [Member]      
Consideration transferred 4,400    
Fixed assets acquired 1,200    
Goodwill acquired 3,100    
Intangible assets acquired 50    
D&D Diagnostics, Inc [Member]      
Consideration transferred 2,400    
Payments to acquire business 1,200    
Payoff of debt 1,200    
Fixed assets acquired 820    
Other assets acquired 16    
Goodwill acquired 1,500    
MRI Centers, Inc. [Member]      
Consideration transferred 800    
Payoff of debt 81    
Fixed assets acquired 289    
Other assets acquired 9,800    
Goodwill acquired 401    
Intangible assets acquired 100    
Resolution Imaging Medical Corp [Member]      
Consideration transferred 4,000    
Advanced Radiological Imaging - Astoria P.C. [Member]      
Consideration transferred 5,000    
Fixed assets acquired 3,600    
Other assets acquired 47    
Goodwill acquired 1,300    
Intangible assets acquired 100    
Breastlink Medical [Member]      
Proceeds from sale of business 2,800    
Gain on sale of investment 845    
Severance costs $ 1,200