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REVENUE RECOGNITION (Tables)
6 Months Ended
Jun. 30, 2019
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
The approximate percentage of net revenue by type of customer was as follows:
    
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
 
Healthcare insurers:
 
 
 
 
 
 
 
 
Fee-for-service
32
%
 
32
%
 
33
%
 
32
%
 
Capitated
3

 
4

 
3

 
4

 
Total healthcare insurers
35

 
36

 
36

 
36

 
Government payers
15

 
16

 
15

 
16

 
Client payers
32

 
31

 
32

 
31

 
Patients
14

 
13

 
13

 
13

 
Total DIS
96

 
96

 
96

 
96

 
DS
4

 
4

 
4

 
4

 
Net revenues
100
%
 
100
%
 
100
%
 
100
%