BUSINESS COMBINATIONS AND RELATED ACTIVITY (Details - Narrative)					9 Months Ended
	Jun. 15, 2022 USD ($) location	Apr. 01, 2022 USD ($)	Mar. 31, 2022 USD ($) shares	Jan. 20, 2022 USD ($) $ / shares shares	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Apr. 01, 2022 location	Apr. 01, 2022 center	Dec. 31, 2021 USD ($)
Business Acquisition [Line Items]
Goodwill					$ 575,092,000				$ 513,820,000
Property and equipment, net					515,569,000				484,247,000
Frederick County Radiology, LLC
Business Acquisition [Line Items]
Ownership interest		65.00%
Frederick County Radiology, LLC | Frederick Health Hospital, Inc.
Business Acquisition [Line Items]
Goodwill		$ 10,800,000
Number of location offering multi-modality services							6	4
Property and equipment, net		8,400,000
Retains		$ 11,100,000
Ownership interest		35.00%
Frederick County Radiology, LLC | Frederick Health Hospital, Inc. | Fixed Assets
Business Acquisition [Line Items]
Property and equipment, net		$ 5,400,000
Frederick County Radiology, LLC | Frederick Health Hospital, Inc. | Equipment
Business Acquisition [Line Items]
Property and equipment, net		$ 3,000,000
Advanced Radiology at Capital Region, LLC
Business Acquisition [Line Items]
Number of location offering multi-modality services | location	2
Ownership interest	51.00%
Payments to acquire additional interest in subsidiaries	$ 5,100
Advanced Radiology at Capital Region, LLC | Dimension Health Corporation
Business Acquisition [Line Items]
Ownership interest	49.00%
Contributed assets	$ 4,900
Aidence B.V
Business Acquisition [Line Items]
Purchase consideration				$ 45,200,000
Shares issued (in shares) | shares				1,141,234
Cash payment to acquire business				$ 1,800,000
Assumed liabilities				11,900,000
Loans settled				1,500,000
Current assets				1,000,000
Property, plant, and equipment				200,000
Intangible assets				27,700,000
Liabilities				3,200,000
Goodwill				19,000,000
Aidence B.V | Cash Holdback
Business Acquisition [Line Items]
Milestone contingent consideration				$ 4,500,000
Aidence B.V | Other Sellers
Business Acquisition [Line Items]
Shares issued (in shares) | shares				1,117,872
Price per share (dollars per share) | $ / shares				$ 26.80
Equity issued or issuable				$ 30,000,000
Aidence B.V | Certain Seller
Business Acquisition [Line Items]
Shares issued (in shares) | shares				23,362
Equity issued or issuable				$ 600,000
Quantib B.V
Business Acquisition [Line Items]
Purchase consideration				$ 42,300,000
Shares issued (in shares) | shares			113,303	965,058
Price per share (dollars per share) | $ / shares				$ 26.80
Equity issued or issuable			$ 3,000,000	$ 25,900,000
Cash payment to acquire business				11,800,000
Milestone contingent consideration					$ 10,228,000	$ 8,437,000			$ 0
Current assets				2,400,000
Property, plant, and equipment				100,000
Intangible assets				21,300,000
Liabilities				3,700,000
Goodwill				$ 22,200,000
Contingent consideration, liability, period				18 months	18 months
Quantib B.V | Cash Holdback
Business Acquisition [Line Items]
Milestone contingent consideration					$ 1,600,000
Aidence Holding B.V.
Business Acquisition [Line Items]
Milestone contingent consideration				$ 7,400,000	$ 7,900,000