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Significant Accounting Policies (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 USD ($) Segment Region | Dec. 31, 2016 USD ($) Region | Dec. 31, 2015 USD ($) Region | Feb. 09, 2018 | Nov. 02, 2015 | Apr. 01, 2013
Depreciation Amortization Impairment [Line Items] |  |  |  |  |  |  |
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%
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 |  | $ 92,600,000 | $ 81,800,000 | $ 73,200,000 |  |  |
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% |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |
Corporate income tax rate |  | 35.00% | 35.00% | 35.00% |  |  |
Estimated reduction in deferred tax liabilities |  | $ (4,300,000) |  |  |  |  |
Accrued interest and penalties associated with any unrecognized tax benefits |  | 0 | $ 0 | $ 0 |  |  |
Interest expense recognized |  | $ 0 | $ 0 |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |  |  |  |  |
Expected reduction in Medicare spending percentage |  |  |  |  | 2.00% |  |
Year 2018 [Member] |  |  |  |  |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |  |  |  |  |
Percentage of increase in medicare payment rates |  | 0.50% |  |  |  |  |
Year 2019 [Member] |  |  |  |  |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |  |  |  |  |
Percentage of increase in medicare payment rates |  | 0.25% |  |  |  |  |
From 2019 through 2024 [Member] |  |  |  |  |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |  |  |  |  |
Percentage of bonus payment by APM |  | 5.00% |  |  |  |  |
From 2020 through 2025 [Member] |  |  |  |  |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |  |  |  |  |
Percentage of increase in medicare payment rates |  | 0.00% |  |  |  |  |
Employee [Member] |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |  |  |  |  |
Period in which restrictions lapse on stock granted |  | 4 years |  |  |  |  |
Director [Member] |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |  |  |  |  |
Period in which restrictions lapse on stock granted |  | 1 year |  |  |  |  |
Officer [Member] |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |  |  |  |  |
Period in which restrictions lapse on stock granted |  | 4 years |  |  |  |  |
Plan [Member] |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |
Corporate income tax rate | 21.00% |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |  |  |  |  |
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] |  |  |  |  |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |  |  |  |  |
Estimated useful lives |  | 3 years |  |  |  |  |
Minimum [Member] | Software [Member] |  |  |  |  |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |  |  |  |  |
Estimated useful lives |  | 3 years |  |  |  |  |
Minimum [Member] | Leasehold Improvements [Member] |  |  |  |  |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |  |  |  |  |
Estimated useful lives |  | 3 years |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |  |  |  |  |
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] |  |  |  |  |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |  |  |  |  |
Annual limit on physical therapy and speech language pathology services |  | $ 1,980 |  |  |  |  |
Annual limit occupational therapy services |  | $ 1,980 |  |  |  |  |
Maximum [Member] | Furniture & Equipment [Member] |  |  |  |  |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |  |  |  |  |
Estimated useful lives |  | 8 years |  |  |  |  |
Maximum [Member] | Software [Member] |  |  |  |  |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |  |  |  |  |
Estimated useful lives |  | 7 years |  |  |  |  |
Maximum [Member] | Leasehold Improvements [Member] |  |  |  |  |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |  |  |  |  |
Estimated useful lives |  | 5 years |  |  |  |  |

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