REVENUE RECOGNITION (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Feb. 09, 2018	Nov. 02, 2015	Apr. 01, 2013
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract]
Revenue related to the various categories	$ 83,857,000	$ 126,373,000	$ 196,574,000	$ 242,604,000
Medicare Reimbursement [Abstract]
Estimated percentage of decrease in payment			9.00%
Federal debt ceiling in connection with deficit reductions			10 years
Reductions in federal spending			$ 1,200,000,000,000
Medicare spending cut percentage			2.00%
Expected reduction in Medicare spending percentage					2.00%	2.00%	2.00%
Percentage of payment adjustment temporary suspended			2.00%
Combined physical therapy/speech language pathology expenses			$ 3,700
Reduction in combined physical therapy/speech language pathology expenses			$ 3,000
Percentage of practice expense component			100.00%
Percentage reduction for service			50.00%
Percentage of payment for outpatient therapy services			85.00%
Net patient revenue from Medicare accounts			$ 44,400,000	59,400,000
Contractual Allowances [Abstract]
Difference between net revenues and corresponding cash collections, approximately of net revenues			1.00%
Difference between actual aggregate contractual reserve and estimated contractual allowance reserve percentage			1.00%
Maximum contractual allowance reserve estimate			1.00%
Year 2017 [Member] | Maximum [Member]
Medicare Reimbursement [Abstract]
Annual limit on physical therapy and speech language pathology services			$ 1,980
Annual limit occupational therapy services			$ 1,980
Year 2018 [Member]
Medicare Reimbursement [Abstract]
Percentage of increase in Medicare payment rates			0.50%
Year 2019 [Member]
Medicare Reimbursement [Abstract]
Percentage of increase in Medicare payment rates			0.25%
From 2019 through 2024 [Member]
Medicare Reimbursement [Abstract]
Percentage of bonus payment by APM			5.00%
From 2020 through 2025 [Member]
Medicare Reimbursement [Abstract]
Percentage of increase in Medicare payment rates			0.00%
Net Patient Revenues [Member]
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract]
Revenue related to the various categories	72,279,000	113,363,000	$ 172,405,000	220,013,000
Management Contract Revenues [Member]
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract]
Revenue related to the various categories	1,592,000	2,215,000	3,740,000	4,360,000
Other Revenues [Member]
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract]
Revenue related to the various categories	328,000	507,000	895,000	1,043,000
Physical Therapy Operations [Member]
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract]
Revenue related to the various categories	74,199,000	116,085,000	177,040,000	225,416,000
Industrial Injury Prevention Services Revenues [Member]
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract]
Revenue related to the various categories	$ 9,658,000	$ 10,288,000	$ 19,534,000	$ 17,188,000