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REVENUE RECOGNITION (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Feb. 09, 2018 | Nov. 02, 2015 | Apr. 01, 2013
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract] |  |  |  |  |  |  |
Revenue related to the various categories | $ 113,122,000 | $ 103,032,000 | $ 336,562,000 | $ 304,848,000 |  |  |
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% |  |  |  |
Medicare Reimbursement [Abstract] |  |  |  |  |  |  |
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%
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 |  |  | $ 76,600,000 | 68,500,000 |  |  |
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 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 | 103,354,000 | 96,273,000 | $ 309,895,000 | 287,584,000 |  |  |
Management Contract Revenues [Member] |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract] |  |  |  |  |  |  |
Revenue related to the various categories | 1,922,000 | 1,703,000 | 6,319,000 | 5,177,000 |  |  |
Industrial Injury Prevention Services Revenues [Member] |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract] |  |  |  |  |  |  |
Revenue related to the various categories | 7,281,000 | 4,364,000 | 18,407,000 | 10,252,000 |  |  |
Other Revenues [Member] |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract] |  |  |  |  |  |  |
Revenue related to the various categories | $ 565,000 | $ 692,000 | $ 1,941,000 | $ 1,835,000 |  |  |

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