GOODWILL AND OTHER INTANGIBLE ASSETS, NET - Goodwill and Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Intangible Assets [Line Items]
Non-cash impairment charge for write-off of intangible assets		$ 4,200
Amortization of Intangible Assets	$ 18,500	16,600
Intangible assets, accumulated amortization	19,900	22,973
Noncompete Agreements [Member]
Intangible Assets [Line Items]
Non-cash impairment charge for write-off of intangible assets		0
Amortization of Intangible Assets	$ 7,600	7,100
Weighted-average amortization period	1 year 3 months 18 days
Intangible assets, accumulated amortization			$ 2,700
Technology-Based Intangible Assets
Intangible Assets [Line Items]
Non-cash impairment charge for write-off of intangible assets		0
Amortization of Intangible Assets	$ 1,200	0
Weighted-average amortization period	6 years 7 months 6 days
Amortizable acquired names [Member]
Intangible Assets [Line Items]
Non-cash impairment charge for write-off of intangible assets		0
Amortization of Intangible Assets	$ 9,000	7,100
Weighted-average amortization period	3 months 18 days
Intangible assets, accumulated amortization			$ 4,400
Certificates of Need and Licenses [Member]
Intangible Assets [Line Items]
Non-cash impairment charge for write-off of intangible assets		0
Amortization of Intangible Assets	$ 700	2,400
Acquired Names [Member]
Intangible Assets [Line Items]
Non-cash impairment charge for write-off of intangible assets		$ 4,200