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Segment Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Information [Abstract]      
Net operating revenues $ 422,969 $ 481,969 $ 453,911
Gross profit 94,450 112,474 101,663
Closure costs 2,072 25 (9)
Total assets 594,361 560,845 443,166
Reportable Segments [Member]      
Segment Information [Abstract]      
Gross profit 98,381 112,499 101,655
Reportable Segments [Member] | Physical Therapy Operations [Member]      
Segment Information [Abstract]      
Net operating revenues 383,770 444,507 428,445
Closure costs 3,931 25 (8)
Total assets 550,181 518,027 421,474
Reportable Segments [Member] | Industrial Injury Prevention Services [Member]      
Segment Information [Abstract]      
Net operating revenues 39,199 37,462 25,466
Gross profit 10,086 8,379 5,192
Total assets 44,180 42,818 21,692
Reportable Segments [Member] | Physical Therapy Operations (Excluding Closure Costs) [Member]      
Segment Information [Abstract]      
Gross profit $ 88,295 $ 104,120 $ 96,463