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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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