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Commitment and contingencies variable interest entities (Details 4) (USD $)
Sep. 30, 2013
Dakota Prairie Refining, LLC [Member]
  
Variable Interest Entities [Line Items]  
Percent of ownership 50.00%
Total project costs $ 300,000,000
Portion of capital commitment 150,000,000
Partner portion of capital commitment 75,000,000
Term loan for project debt financing 75,000,000
Dakota Prairie Refining, LLC [Member] | Cash and Cash Equivalents [Member]
  
Variable Interest Entities [Line Items]  
Limited liability entity, consolidated, carrying amount, assets 23,146,000
Dakota Prairie Refining, LLC [Member] | Accounts receivable [Member]
  
Variable Interest Entities [Line Items]  
Limited liability entity, consolidated, carrying amount, assets 1,000
Dakota Prairie Refining, LLC [Member] | Other current assets [Member]
  
Variable Interest Entities [Line Items]  
Limited liability entity, consolidated, carrying amount, assets 25,000
Dakota Prairie Refining, LLC [Member] | Total current assets [Member]
  
Variable Interest Entities [Line Items]  
Limited liability entity, consolidated, carrying amount, assets 23,172,000
Dakota Prairie Refining, LLC [Member] | Net property, plant and equipment [Member]
  
Variable Interest Entities [Line Items]  
Limited liability entity, consolidated, carrying amount, assets 123,297,000
Dakota Prairie Refining, LLC [Member] | Total assets [Member]
  
Variable Interest Entities [Line Items]  
Limited liability entity, consolidated, carrying amount, assets 146,469,000
Dakota Prairie Refining, LLC [Member] | Accounts Payable [Member]
  
Variable Interest Entities [Line Items]  
Limited liability entity, consolidated, carrying amount, liabilities 20,313,000
Dakota Prairie Refining, LLC [Member] | Long-term debt due within one year [Member]
  
Variable Interest Entities [Line Items]  
Limited liability entity, consolidated, carrying amount, liabilities 3,000,000
Dakota Prairie Refining, LLC [Member] | Other accrued liabilities [Member]
  
Variable Interest Entities [Line Items]  
Limited liability entity, consolidated, carrying amount, liabilities 363,000
Dakota Prairie Refining, LLC [Member] | Total current liabilities [Member]
  
Variable Interest Entities [Line Items]  
Limited liability entity, consolidated, carrying amount, liabilities 23,676,000
Dakota Prairie Refining, LLC [Member] | Long-term debt [Member]
  
Variable Interest Entities [Line Items]  
Limited liability entity, consolidated, carrying amount, liabilities 72,000,000
Dakota Prairie Refining, LLC [Member] | Total liabilities [Member]
  
Variable Interest Entities [Line Items]  
Limited liability entity, consolidated, carrying amount, liabilities 95,676,000
Fuel contract [Member]
  
Variable Interest Entities [Line Items]  
Percent of ownership 25.00%
Variable interest entity, reporting entity involvement, maximum loss exposure, amount $ 7,400,000