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Major Customers (Details) - customer	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Customer Concentration Risk | Sales Revenue, Goods, Net
Concentration Risk [Line Items]
Number of customers	5	5	5	5,000,000
Concentration risk (as a percent) (more than for 10.0%)	40.40%	42.80%
Customer Concentration Risk | Accounts Receivable
Concentration Risk [Line Items]
Number of customers			5		5
Credit Concentration Risk | Sales Revenue, Goods, Net
Concentration Risk [Line Items]
Concentration risk (as a percent) (more than for 10.0%)			40.50%		42.00%
Credit Concentration Risk | Accounts Receivable
Concentration Risk [Line Items]
Concentration risk (as a percent) (more than for 10.0%)			40.90%	41.90%	37.70%
North America | Sales Revenue, Goods, Net
Concentration Risk [Line Items]
Number of customers	1	1	1	1
North America | Customer Concentration Risk | Sales Revenue, Goods, Net
Concentration Risk [Line Items]
Number of customers	5	5	5	5
Concentration risk (as a percent) (more than for 10.0%)	23.80%	25.80%	22.40%	24.00%

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- Definition

The number of major customers who have a combined sales and accounts receivable concentration of greater than 10% and is separately disclosed.

+ References

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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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- 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=64851502&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=73719730&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=64851502&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=73719730&loc=d3e13537-108611

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