GOODWILL AND OTHER INTANGIBLE ASSETS (Details - Schedule of Goodwill) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 256,776	$ 239,553
Goodwill disposed of through sale or transfer	(80)
Goodwill transferred to other assets	(1,059)	(289)
Goodwill, impairment loss	(3,800)
Goodwill, ending balance	418,093	256,776
Resolution Imaging Medical Corp
Goodwill [Roll Forward]
Goodwill acquired through acquisitions		1,901
MRI Centers, Inc.
Goodwill [Roll Forward]
Goodwill acquired through acquisitions		401
Santa Monica Imaging Group JV
Goodwill [Roll Forward]
Goodwill disposed of through sale or transfer		(1,901)
D&D Diagnostics, Inc
Goodwill [Roll Forward]
Goodwill acquired through acquisitions		1,519
Stockton MRI, Inc
Goodwill [Roll Forward]
Goodwill acquired through acquisitions		3,101
Hematology Oncology
Goodwill [Roll Forward]
Goodwill disposed of through sale or transfer		(110)
DIA, Inc
Goodwill [Roll Forward]
Goodwill acquired through acquisitions		9,185
Adjustments to our preliminary allocation of the purchase price of DIA, Inc.		1,058
Breastlink Medical
Goodwill [Roll Forward]
Goodwill disposed of through sale or transfer		(509)
RDI, Inc.
Goodwill [Roll Forward]
Goodwill acquired through acquisitions		1,202
RadSite, LLC
Goodwill [Roll Forward]
Goodwill acquired through acquisitions		$ 1,665
Imaging Services Company of New York
Goodwill [Roll Forward]
Goodwill acquired through acquisitions	2,692
MemorialCare Medical Foundation
Goodwill [Roll Forward]
Goodwill acquired through acquisitions	545
Womens Imaging Specialists
Goodwill [Roll Forward]
Goodwill acquired through acquisitions	4,268
Valley Metabolic Imaging
Goodwill [Roll Forward]
Goodwill acquired through acquisitions	1,469
Sierra Imaging Associates
Goodwill [Roll Forward]
Goodwill acquired through acquisitions	1,147
Washington Heights Medical Management
Goodwill [Roll Forward]
Goodwill acquired through acquisitions	2,303
Medical Arts Radiological Group, PC
Goodwill [Roll Forward]
Goodwill acquired through acquisitions	41,469
Arcadia Radiology Imaging
Goodwill [Roll Forward]
Goodwill acquired through acquisitions	2,582
Southern California Diagnostic Imaging, Inc
Goodwill [Roll Forward]
Goodwill acquired through acquisitions	41
Orange County Diagnostics Imaging Center
Goodwill [Roll Forward]
Goodwill acquired through acquisitions	3,618
New Jersey Imaging Network, LLC
Goodwill [Roll Forward]
Goodwill acquired through acquisitions	$ 106,122