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Significant Accounting Policies (Details)		3 Months Ended								12 Months Ended
	Feb. 26, 2020 USD ($) Clinic Partnership	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) Clinic Segment Region Partnership	Dec. 31, 2018 USD ($) Clinic Region Partnership	Dec. 31, 2017 USD ($) Clinic Region Partnership	Feb. 09, 2018	Nov. 02, 2015	Apr. 01, 2013
Revenue Recognition [Abstract]
Revenue related to the various categories		$ 122,114,000	$ 117,251,000	$ 126,373,000	$ 116,231,000	$ 117,349,000	$ 113,122,000	$ 115,098,000	$ 108,342,000	$ 481,969,000	$ 453,911,000	$ 414,051,000
Basis of Presentation [Abstract]
Number of business segments | Segment										1
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										$ 119,400,000	$ 103,600,000	92,600,000
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%	21.00%	35.00%
Goodwill [Abstract]
Number of regions | Region										6	6	6
Income Taxes [Abstract]
Accrued interest and penalties associated with any unrecognized tax benefits		0				0				$ 0	$ 0	$ 0
Interest expense recognized										0	0	$ 0
Recently Adopted Accounting Guidance [Abstract]
Operating lease right-of-use assets		81,586,000				$ 0				81,586,000	$ 0
Lease Liability		86,744,000								$ 86,744,000
Subsequent Event [Abstract]
Number of clinic practices acquired | Clinic										1	5	2
Number of partnerships | Partnership										4	3	2
Percentage of equity interests acquired												35.00%
February 2020 Acquisition [Member] | Subsequent Event [Member]
Subsequent Event [Abstract]
Acquisition date	Feb. 26, 2020
Number of clinic practices acquired | Clinic	4
Number of partnerships | Partnership	4
Percentage of equity interests acquired	65.00%
Percentage of associates equity retained	35.00%
Aggregate purchase price for the acquired clinic practices	$ 12,200,000
ASU 2016-02 [Member]
Recently Adopted Accounting Guidance [Abstract]
Operating lease right-of-use assets		78,000,000								$ 78,000,000
Lease Liability		$ 82,600,000								$ 82,600,000
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]
Restricted Stock [Abstract]
Period in which restrictions lapse on stock granted										4 years
Director [Member]
Restricted Stock [Abstract]
Period in which restrictions lapse on stock granted										1 year
Officer [Member]
Restricted Stock [Abstract]
Period in which restrictions lapse on stock granted										4 years
Minimum [Member]
Redeemable Non-Controlling Interests [Abstract]
Redeemable non-controlling interest, redemption rights, commencement period										3 years
Mandatorily Redeemable Non-Controlling Interests [Abstract]
Mandatorily redeemable non-controlling interest, redemption rights, commencement period										3 years
Subsequent Event [Abstract]
Percentage of equity interests acquired		1.00%				5.50%				1.00%	5.50%
Minimum [Member] | Furniture & Equipment [Member]
Long-Lived Assets [Abstract]
Estimated useful lives										3 years
Minimum [Member] | Software [Member]
Long-Lived Assets [Abstract]
Estimated useful lives										3 years
Minimum [Member] | Leasehold Improvements [Member]
Long-Lived Assets [Abstract]
Estimated useful lives										3 years
Maximum [Member]
Redeemable Non-Controlling Interests [Abstract]
Redeemable non-controlling interest, redemption rights, commencement period										5 years
Mandatorily Redeemable Non-Controlling Interests [Abstract]
Mandatorily redeemable non-controlling interest, redemption rights, commencement period										5 years
Subsequent Event [Abstract]
Percentage of equity interests acquired		55.00%				35.00%				55.00%	35.00%
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]
Long-Lived Assets [Abstract]
Estimated useful lives										8 years
Maximum [Member] | Software [Member]
Long-Lived Assets [Abstract]
Estimated useful lives										7 years
Maximum [Member] | Leasehold Improvements [Member]
Long-Lived Assets [Abstract]
Estimated useful lives										5 years
Net Patient Revenues [Member]
Revenue Recognition [Abstract]
Revenue related to the various categories		$ 108,940,000	$ 104,392,000	$ 113,363,000	$ 106,650,000	$ 107,808,000	$ 103,354,000	$ 105,989,000	$ 100,552,000	$ 433,345,000	$ 417,703,000	$ 389,226,000
Management Contract Revenues [Member]
Revenue Recognition [Abstract]
Revenue related to the various categories										8,676,000	8,339,000	6,275,000
Industrial Injury Prevention Services Revenues [Member]
Revenue Recognition [Abstract]
Revenue related to the various categories										37,462,000	25,466,000	14,908,000
Other Revenues [Member]
Revenue Recognition [Abstract]
Revenue related to the various categories										$ 2,486,000	$ 2,403,000	$ 3,642,000

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