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Acquisitions of Businesses, 2021 Acquisition (Details) $ in Thousands									12 Months Ended
	Dec. 31, 2021 USD ($) Clinic		Nov. 30, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($) Clinic	Mar. 31, 2021 USD ($) Clinic	Nov. 30, 2020 USD ($) Clinic	Feb. 27, 2020 USD ($) Clinic	Dec. 31, 2021 USD ($) Clinic		Dec. 31, 2020 Clinic	Apr. 11, 2019 USD ($)	[1]
Business Combination, Description [Abstract]
Number of clinics | Clinic									5		3
Previous Owners [Member]
Business Combination, Description [Abstract]
Percentage of retained interest by previous owners					35.00%	30.00%	25.00%
IIPS [Member]
Business Combination, Description [Abstract]
Percentage of interest acquired			70.00%
Number of clinics | Clinic									3
Aggregate purchase price for the acquisition			$ 63,200
Contingent payment consideration	$ 2,520	[1]	2,000						$ 2,520	[1]
Cash paid for acquisition			60,700
Notes payable	$ 1,250	[1]	$ 1,000						$ 1,250	[1]		$ 4,000
Percentage of interest accrued			3.25%
Remaining contract term									5 years
Ownership rights			$ 3,500						$ 3,522	[1]
Return-to-work and Ergonomic Services [Member]
Business Combination, Description [Abstract]
Aggregate purchase price for the acquisition				$ 2,700
Contingent payment consideration				600
Aggregate purchase price for the acquisition including contingent consideration				3,300
Cash paid for acquisition				2,400
Notes payable				$ 300
Percentage of interest accrued				3.25%
Clinic Practice [Member]
Business Combination, Description [Abstract]
Percentage of interest acquired	75.00%				65.00%	70.00%	75.00%	65.00%	75.00%
Number of clinics | Clinic	3				8	5	3	4
Percentage of interest retained by practice founder	25.00%								25.00%
Aggregate purchase price for the acquisition	$ 3,700				$ 10,300	$ 12,000	$ 8,900	$ 11,900
Contingent payment consideration					800
Cash paid for acquisition	3,500				9,000	11,700	8,600	11,600
Amount payable upon achievement of certain business criteria					1,000
Notes payable	$ 200				$ 300	$ 300	$ 300	$ 300	$ 200
Percentage of interest accrued	3.25%				3.25%	3.25%	3.25%	4.75%	3.25%
[1] Industrial injury prevention services

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