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Significant Accounting Policies (Details) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) Segment Region | Dec. 31, 2017 USD ($) Region | Dec. 31, 2016 USD ($) Region | Feb. 09, 2018 | Nov. 02, 2015 | Apr. 01, 2013
Revenue Recognition [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue related to the various categories | $ 117,349,000 | $ 113,122,000 | $ 115,098,000 | $ 108,342,000 | $ 109,203,000 | $ 103,032,000 | $ 104,251,000 | $ 97,565,000 | $ 453,911,000 | $ 414,051,000 | $ 356,546,000 |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of business segments | Segment |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Number of regions | Region |  |  |  |  |  |  |  |  | 6 | 6 | 6 |  |  |
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 |  |  |  |  |  |  |  |  | $ 103,600,000 | $ 92,600,000 | $ 81,800,000 |  |  |
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% |  |  |  |  |
Estimated reduction in deferred tax liabilities |  |  |  |  |  |  |  |  |  | $ (4,300,000) |  |  |  |
Corporate income tax rate |  |  |  |  |  |  |  |  | 21.00% | 35.00% | 35.00% |  |  |
Accrued interest and penalties associated with any unrecognized tax benefits | 0 |  |  |  | 0 |  |  |  | $ 0 | $ 0 | $ 0 |  |  |
Interest expense recognized |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |  |
ASU 2016-02 [Member] | Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right to use assets | 78,000,000 |  |  |  |  |  |  |  | 78,000,000 |  |  |  |  |
Lease Liability | 82,600,000 |  |  |  |  |  |  |  | $ 82,600,000 |  |  |  |  |
Year 2018 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of increase in Medicare payment rates |  |  |  |  |  |  |  |  | 0.50% |  |  |  |  |
Year 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of increase in Medicare payment rates |  |  |  |  |  |  |  |  | 0.25% |  |  |  |  |
From 2019 through 2024 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of bonus payment by APM |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |
From 2020 through 2025 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of increase in Medicare payment rates |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |
Employee [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation Arrangements [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period in which restrictions lapse on stock granted |  |  |  |  |  |  |  |  | 4 years |  |  |  |  |
Director [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation Arrangements [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period in which restrictions lapse on stock granted |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |
Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Compensation Arrangements [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period in which restrictions lapse on stock granted |  |  |  |  |  |  |  |  | 4 years |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mandatorily redeemable non-controlling interest, redemption rights, commencement period |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Redeemable non-controlling interest, redemption rights, commencement period |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Minimum [Member] | Furniture & Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Minimum [Member] | Software [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Minimum [Member] | Leasehold Improvements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mandatorily redeemable non-controlling interest, redemption rights, commencement period |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |
Redeemable non-controlling interest, redemption rights, commencement period |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |
Maximum [Member] | Year 2017 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual limit on physical therapy and speech language pathology services |  |  |  |  |  |  |  |  | $ 1,980 |  |  |  |  |
Annual limit occupational therapy services |  |  |  |  |  |  |  |  | $ 1,980 |  |  |  |  |
Maximum [Member] | Furniture & Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  | 8 years |  |  |  |  |
Maximum [Member] | Software [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  | 7 years |  |  |  |  |
Maximum [Member] | Leasehold Improvements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |
Patient Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue related to the various categories | $ 107,808,000 | $ 103,354,000 | $ 105,989,000 | $ 100,552,000 | $ 101,642,000 | $ 96,273,000 | $ 97,657,000 | $ 93,654,000 | $ 417,703,000 | 389,226,000 | 348,839,000 |  |  |
Management Contract Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue related to the various categories |  |  |  |  |  |  |  |  | 8,339,000 | 6,275,000 | 5,535,000 |  |  |
Industrial Injury Prevention Services Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue related to the various categories |  |  |  |  |  |  |  |  | 25,466,000 | 14,908,000 | 0 |  |  |
Other Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue related to the various categories |  |  |  |  |  |  |  |  | $ 2,403,000 | $ 3,642,000 | $ 2,172,000 |  |  |

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