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://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=6927468&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 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611

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=6927468&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 20

-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13531-108611

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

General information, details (Details)	12 Months Ended
General information, details (Details)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
[MinimumMember]
Concentration Risk [Line Items]
Concentration Risk, Percentage	10.00%	10.00%	10.00%
[MajorCustomerMember]
Concentration Risk [Line Items]
Concentration Risk, Percentage	46.00%	73.00%	51.00%
[MajorCustomerBMember]
Concentration Risk [Line Items]
Concentration Risk, Percentage	22.00%
[MajorCustomerCMember]
Concentration Risk [Line Items]
Concentration Risk, Percentage	22.00%
[MajorCustomerDMember]
Concentration Risk [Line Items]
Concentration Risk, Percentage		27.00%	41.00%