For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

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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 of revenue recognized arising from contract liability from change in timeframe for performance obligation to be satisfied.

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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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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
REVENUE (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Total Revenue	$ 175,789	$ 218,106	$ 344,373	$ 435,916
Gross profit	59,957	67,611	115,005	132,486
Bad debt expense	0	$ 6,117	0	$ 13,160
Allowance for doubtful accounts	0		0		$ 37,912
Revenue recognized related to prior period performance obligations	7,700		9,000
Commercial
Disaggregation of Revenue [Line Items]
Total Revenue	152,251		292,792
Government
Disaggregation of Revenue [Line Items]
Total Revenue	22,397		48,939
Patient
Disaggregation of Revenue [Line Items]
Total Revenue	1,141		2,642
Calculated under Revenue Guidance in Effect before Topic 606
Disaggregation of Revenue [Line Items]
Total Revenue	181,200		355,200
Gross profit	65,300		125,800
Bad debt expense	5,400		10,800
Allowance for doubtful accounts	$ 48,700		$ 48,700
Revenue from Rights Concentration Risk \| Sales Revenue, Net
Disaggregation of Revenue [Line Items]
Percentage of concentration risk			1.00%