The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(a),(d))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1,2)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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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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SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended								12 Months Ended
SEGMENT REPORTING (Details) $ in Thousands	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Segment reporting information
Number of reportable segments \| segment									2
Net Sales									$ 5,492,524	$ 4,485,230	$ 4,410,388
Cost of Sales									(5,116,515)	(4,211,085)	(4,144,802)
Gross Profit	$ 93,856	$ 93,358	$ 98,416	$ 90,378	$ 72,579	$ 65,090	$ 66,714	$ 69,762	376,009	274,145	265,586
Inter-segment eliminations
Segment reporting information
Net Sales									(27,768)
Cost of Sales									27,768
Specialty \| Operating Segments
Segment reporting information
Net Sales									4,790,837	4,472,857	4,410,388
Cost of Sales									(4,510,262)	(4,202,766)	(4,144,802)
Gross Profit									280,575	270,091	$ 265,586
PBM \| Operating Segments
Segment reporting information
Net Sales									729,455	12,373
Cost of Sales									(634,021)	(8,319)
Gross Profit									$ 95,434	$ 4,054