For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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CONCENTRATION OF RISK (Details) - Customer Concentration Risk	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
United Healthcare
Concentration Risk [Line Items]
Percentage of concentration risk		21.90%		22.40%
Medicare
Concentration Risk [Line Items]
Percentage of concentration risk	7.70%	7.10%	8.00%	7.00%