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Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Revenue from External Customer [Line Items]
Fees to GPOs	$ 2,200	$ 1,900
Short-term deferred revenues	90,104		$ 81,835
Deferred revenues recognized	39,300
Contract with Customer, Liability, Current, Gross			92,900
Long-term deferred revenues	10,302		10,582
Deferred cost of sale,short-term
Revenue from External Customer [Line Items]
Short-term deferred revenues	$ 12,200		$ 11,100

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- Definition

Contract with Customer, Liability, Current, Gross

+ References

No definition available.

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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

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-Publisher FASB
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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer.

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