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The valuation allowance as of the balance sheet date to reduce the gross amount of receivables to estimated net realizable value, which would be presented in parentheses on the face of the balance sheet.

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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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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant.

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

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Amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy.

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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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Amount of cash inflow for proceeds from settlement of insurance claim, classified as operating activities. Excludes insurance settlement classified as investing activities.

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Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Concentration Risk [Line Items]
Allowance for doubtful accounts	$ 0	$ 0
Unbilled receivables	79,000,000.0	68,700,000
Gain on business casualty loss	0	626,000	$ (3,549,000)
Rebate receivable	35,200,000	13,900,000
Investments in equity-method investees	17,000,000.0	17,000,000.0
Proportionate share of earnings in equity-method investees	3,313,000	2,840,000	1,020,000
Capital distribution from equity method investments	$ 3,250,000	$ 500,000	$ 2,000,000
Renewal term length	2 years
Revenue from Contract with Customer Benchmark \| Company's Largest Payer
Concentration Risk [Line Items]
Concentration risk	15.00%	16.00%	17.00%
Revenue from Contract with Customer Benchmark \| Governmental Programs
Concentration Risk [Line Items]
Concentration risk	15.00%	12.00%	12.00%
Accounts Receivable \| Governmental Programs
Concentration Risk [Line Items]
Concentration risk	15.00%	12.00%
Cost of Goods and Service, Product and Service Benchmark \| Medical Supply Vendors
Concentration Risk [Line Items]
Concentration risk	70.00%	70.00%	66.00%
Hurricane
Concentration Risk [Line Items]
Inventory write-down			$ 2,900,000
Insurance proceeds			800,000
Insurance receivable			$ 1,000,000.0
Infusion pumps
Concentration Risk [Line Items]
Intangible asset useful life (in years)	7 years
Computer Software
Concentration Risk [Line Items]
Intangible asset useful life (in years)	5 years
Minimum \| Referral sources
Concentration Risk [Line Items]
Intangible asset useful life (in years)	15 years
Minimum \| Trademarks/Names
Concentration Risk [Line Items]
Intangible asset useful life (in years)	2 years
Minimum \| Other amortizable intangible assets
Concentration Risk [Line Items]
Intangible asset useful life (in years)	2 years
Minimum \| Equipment
Concentration Risk [Line Items]
Intangible asset useful life (in years)	3 years
Maximum \| Referral sources
Concentration Risk [Line Items]
Intangible asset useful life (in years)	20 years
Maximum \| Trademarks/Names
Concentration Risk [Line Items]
Intangible asset useful life (in years)	15 years
Maximum \| Other amortizable intangible assets
Concentration Risk [Line Items]
Intangible asset useful life (in years)	9 years
Maximum \| Equipment
Concentration Risk [Line Items]
Intangible asset useful life (in years)	13 years
Inventories \| Hurricane
Concentration Risk [Line Items]
Insurance proceeds		$ 3,000,000.0
Gain on business casualty loss		$ 2,000,000.0