REVENUE RECOGNITION (Tables)

9 Months Ended

Sep. 30, 2018

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 September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Healthcare insurers:
Fee-for-service	32	%	34	%	32	%	33	%
Capitated	3		4		4		4
Total healthcare insurers	35		38		36		37
Government payers	16		17		16		16
Client payers	32		30		31		30
Patient	13		11		13		12
Total DIS	96		96		96		95
DS	4		4		4		5
Net revenues	100	%	100	%	100	%	100	%