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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Segment Information Schedule of revenue by major customers (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Minimum [Member]
Revenue, Major Customer [Line Items]
Percentage of revenues	10.00%
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member] \| AmerisourceBergen Corp [Member]
Revenue, Major Customer [Line Items]
Percentage of revenues	20.00%	20.00%	18.00%
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member] \| Cardinal Health Inc [Member]
Revenue, Major Customer [Line Items]
Percentage of revenues	21.00%	19.00%	16.00%
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member] \| McKesson Corp [Member]
Revenue, Major Customer [Line Items]
Percentage of revenues	21.00%	23.00%	22.00%