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GOODWILL AND OTHER INTANGIBLE ASSETS (Details - Schedule of Goodwill) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | $ 441,973 | $ 418,093
Goodwill disposed of through sale or transfer |  | (123)
Goodwill transferred to other assets |  | 992
Goodwill, ending balance | 472,879 | 441,973
Medical Arts Radiological Group, PC |  |
Goodwill [Roll Forward] |  |
Goodwill acquired through acquisitions |  | 722
Dignity Health |  |
Goodwill [Roll Forward] |  |
Goodwill acquired through acquisitions |  | 1
West Valley Imaging Group, LLC |  |
Goodwill [Roll Forward] |  |
Goodwill acquired through acquisitions |  | 2,490
Hudson Valley Radiology Associates |  |
Goodwill [Roll Forward] |  |
Goodwill acquired through acquisitions |  | 3,125
Kern Radiology Imaging Systems Inc. |  |
Goodwill [Roll Forward] |  |
Goodwill acquired through acquisitions |  | 10,507
Zilkha Radiology |  |
Goodwill [Roll Forward] |  |
Goodwill acquired through acquisitions |  | 2,577
Ramic Mahwah LLC |  |
Goodwill [Roll Forward] |  |
Goodwill acquired through acquisitions |  | 231
Garden State Radiology Network LLC |  |
Goodwill [Roll Forward] |  |
Goodwill acquired through acquisitions |  | 2,021
Nulogix, Inc. |  |
Goodwill [Roll Forward] |  |
Goodwill acquired through acquisitions |  | $ 1,337
Olney Open MRI, LLC |  |
Goodwill [Roll Forward] |  |
Goodwill acquired through acquisitions | 601 |
MRI at Woodbridge, LLC |  |
Goodwill [Roll Forward] |  |
Goodwill acquired through acquisitions | 1,833 |
DeepHealth, Inc. |  |
Goodwill [Roll Forward] |  |
Goodwill acquired through acquisitions | 23,299 |
AZ-Tech Radiology & Open MRI, LLC |  |
Goodwill [Roll Forward] |  |
Goodwill acquired through acquisitions | 2,882 |
ZP Ozone Park, LLC |  |
Goodwill [Roll Forward] |  |
Goodwill acquired through acquisitions | 828 |
ZP Elmhurst LLC |  |
Goodwill [Roll Forward] |  |
Goodwill acquired through acquisitions | $ 1,463 |

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