ASSETS HELD FOR SALE - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current liabilities held for sale	$ 4,291		$ 5,767
Patient service operating revenues	193,182	$ 191,762
Certain Clinics In Pennsylvania, Ohio, and New Jersey and Other Property and Equipment | Disposal Group, Held-for-sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Reduction on valuation allowance	505
Current assets held for sale	49,197		50,099
Current liabilities held for sale	4,291		$ 5,767
Certain Clinics in Pennsylvania, Ohio, and New Jersey | Disposal Group, Held-for-sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Patient service operating revenues	$ 6,773