BUSINESS SEGMENTS - INCOME FROM OPERATIONS (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue, Major Customer [Line Items]
Segment Adjusted EBITDAR from Operations	$ 18,615		$ 20,738		$ 34,842	$ 38,359
Less: Depreciation and amortization	1,170		1,201		2,345	2,222
Rent—cost of services	10,156		9,767		20,121	19,473
Other expense	(24)		0		(24)	0
Less: Costs at start-up operations	347		473		459	705
Share-based compensation expense	2,499		1,959		4,915	3,915
Acquisition related costs	30		0		37	0
Transaction services costs	687		380		1,589	537
Net COVID-19 related costs	0		883		0	1,160
Add: Net loss attributable to noncontrolling interest	(181)	$ (37)	0		(218)	0
Income from operations	3,569		6,075		5,182	10,347
Sequestration relief	870				1,818
Direct medical supplies, labor, and other expenses			554	$ 277	554	554
Transition Services Agreement | Related party
Revenue, Major Customer [Line Items]
Expenses from transactions with related party	$ 747		1,525		$ 1,735	2,861
Transition Services Costs | Related party
Revenue, Major Customer [Line Items]
Transaction services costs			$ 113			$ 220