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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right to consideration is unconditional.

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Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Concentration Risk [Line Items]
Rebate receivable	$ 31,700		$ 35,200
Investments in equity-method investees	18,200		$ 17,000
Proportionate share of earnings in equity-method investees	$ 1,205	$ 562
Capital distribution received from investment		$ 500
Revenue from Contract with Customer Benchmark \| Company's Largest Payer
Concentration Risk [Line Items]
Concentration risk	16.00%	13.00%
Contract term	2 years
Revenue from Contract with Customer Benchmark \| Governmental Programs
Concentration Risk [Line Items]
Concentration risk	18.00%	12.00%
Accounts Receivable \| Governmental Programs
Concentration Risk [Line Items]
Concentration risk	13.00%		15.00%
Cost of Goods and Service, Product and Service Benchmark \| Medical Supply Vendors
Concentration Risk [Line Items]
Concentration risk	67.00%	70.00%