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SIGNIFICANT ACCOUNTING POLICIES (Details - Revenue) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue from External Customer [Line Items]
Revenue	$ 354,375	$ 333,918	$ 696,141	$ 649,237
Imaging Center Segment Revenue
Revenue from External Customer [Line Items]
Revenue	352,818	333,918	693,985	649,237
Commercial insurance
Revenue from External Customer [Line Items]
Revenue	195,066	187,354	383,615	369,566
Medicare
Revenue from External Customer [Line Items]
Revenue	77,879	71,407	148,800	134,877
Medicaid
Revenue from External Customer [Line Items]
Revenue	9,704	9,039	18,788	17,486
Workers' compensation/personal injury
Revenue from External Customer [Line Items]
Revenue	13,138	10,556	25,586	20,966
Other patient revenue
Revenue from External Customer [Line Items]
Revenue	7,567	5,189	14,689	9,961
Management fee revenue
Revenue from External Customer [Line Items]
Revenue	5,592	5,533	11,100	10,752
Software revenue
Revenue from External Customer [Line Items]
Revenue	2,421	2,628	6,419	5,054
Other
Revenue from External Customer [Line Items]
Revenue	3,577	3,788	8,623	6,409
Revenue under capitation arrangements
Revenue from External Customer [Line Items]
Revenue	37,874	38,424	76,365	74,166
AI Segment Revenue
Revenue from External Customer [Line Items]
Revenue	$ 1,557	$ 0	$ 2,156	$ 0

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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