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Market Concentrations (Schedule of Revenues Concentration from Major Customers and Narrative) (Details) - Customer Concentration Risk	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Sales Revenue, Goods, Gross | Customer 1
Concentration Risk [Line Items]
Concentration risk, percentage	26.00%	25.00%	22.00%
Sales Revenue, Goods, Gross | Customer 2
Concentration Risk [Line Items]
Concentration risk, percentage	24.00%	22.00%	28.00%
Sales Revenue, Goods, Gross | Customer 3
Concentration Risk [Line Items]
Concentration risk, percentage	25.00%	25.00%	29.00%
Sales Revenue, Goods, Gross | Customer 4
Concentration Risk [Line Items]
Concentration risk, percentage			10.00%
Sales Revenue, Goods, Gross | Customer 5
Concentration Risk [Line Items]
Concentration risk, percentage	11.00%
Accounts Receivable
Concentration Risk [Line Items]
Concentration risk, percentage	78.00%	53.00%

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- Definition

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.

+ References

No definition available.

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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