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Market Concentrations (Schedule of Revenues Concentration from Major Customers and Narrative) (Details) - Customer Concentration Risk - customer	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Sales Revenue, Goods, Gross | Customer 1
Concentration Risk [Line Items]
Concentration risk, percentage	25.00%	22.00%	22.00%
Sales Revenue, Goods, Gross | Customer 2
Concentration Risk [Line Items]
Concentration risk, percentage	22.00%	28.00%	28.00%
Sales Revenue, Goods, Gross | Customer 3
Concentration Risk [Line Items]
Concentration risk, percentage	25.00%	29.00%	32.00%
Sales Revenue, Goods, Gross | Customer 4
Concentration Risk [Line Items]
Concentration risk, percentage		10.00%
Accounts Receivable
Concentration Risk [Line Items]
Concentration risk, percentage	53.00%	86.00%
Concentration risk, number of major customers exceeding 10 percent threshhold		4

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- Definition

Concentration risk, number of major customers exceeding 10 percent threshhold

+ References

No definition available.

+ Details

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611

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