Summary of Significant Accounting Policies (Major Customers) (Details) (Sales Revenue, Goods, Net [Member], Customer Concentration Risk [Member])
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12 Months Ended | ||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Concentration Risk [Line Items] | |||
Concentration Risk, Percentage | 100.00% | 100.00% | 100.00% |
Enterprise Crude Oil, LLC [Member]
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Concentration Risk [Line Items] | |||
Concentration Risk, Percentage | 38.00% | 32.00% | 16.00% |
Shell Trading Company [Member]
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Concentration Risk [Line Items] | |||
Concentration Risk, Percentage | 31.00% | 39.00% | 45.00% |
Plains Marketing, L.P. [Member]
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Concentration Risk [Line Items] | |||
Concentration Risk, Percentage | 15.00% | 15.00% | 17.00% |
Other [Member]
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Concentration Risk [Line Items] | |||
Concentration Risk, Percentage | 16.00% | 14.00% | 22.00% |
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- Details
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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