SIGNIFICANT ACCOUNTING POLICIES (Details - Goodwill) $ in Thousands	6 Months Ended
Jun. 30, 2021 USD ($)
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 472,879
Other Adjustments	(28)
Goodwill, Ending Balance	502,331
Business Acquisitions
Goodwill [Roll Forward]
Goodwill Acquired through acquisitions	29,375
Goodwill, Ending Balance	29,375
Simi Valley Imaging Group, LLC
Goodwill [Roll Forward]
Goodwill Acquired through acquisitions	$ 105

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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- Definition

Amount of increase (decrease), classified as other, of an asset representing the future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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