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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Significant Accounting Policies [Abstract]  
Disaggregation of Revenue, Categories
The following table details the revenue related to the various categories.

  Year Ended December 31,
 
 
  2018  
2017
  
2016
 
Patient revenues
 
$
417,703
   
389,226
   
348,839
 
Management contract revenues
  
8,339
   
6,275
   
5,535
 
Industrial injury prevention services revenues
  
25,466
   
14,908
   
-
 
Other revenues
  
2,403
   
3,642
   
2,172
 
  
$
453,911
  
$
414,051
  
$
356,546