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Segment Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Information [Abstract]      
Net operating revenue $ 495,022 $ 422,969 $ 481,969
Gross profit 117,182 94,450 112,474
Closure costs 30 2,072 25
Total assets 749,426 594,361 630,501
Reportable Segments [Member]      
Segment Information [Abstract]      
Gross profit 117,212 98,381 112,499
Reportable Segments [Member] | Physical Therapy Operations [Member]      
Segment Information [Abstract]      
Net operating revenue 451,122 383,770 444,507
Closure costs 30 3,931 25
Total assets 587,801 499,911 518,027
Reportable Segments [Member] | Industrial Injury Prevention Services [Member]      
Segment Information [Abstract]      
Net operating revenue 43,900 39,199 37,462
Gross profit 10,694 10,086 8,379
Total assets 161,625 94,450 112,474
Reportable Segments [Member] | Physical Therapy Operations (Less Closure Costs) (a non-GAAP measure) [Member]      
Segment Information [Abstract]      
Gross profit $ 106,518 $ 88,295 $ 104,120