REVENUE RECOGNITION (Tables)

6 Months Ended

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