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Commitment and contingencies variable interest entities (Details 4) (USD $)
Sep. 30, 2014
Dec. 31, 2013
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    
Excess capital commitments 300,000,000    
Project cost estimate 360,000,000    
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 16,723,000 4,774,000 23,146,000
Dakota Prairie Refining, LLC [Member] | Accounts receivable [Member]
      
Variable Interest Entities [Line Items]      
Limited liability entity, consolidated, carrying amount, assets 150,000 0 1,000
Dakota Prairie Refining, LLC [Member] | Other current assets [Member]
      
Variable Interest Entities [Line Items]      
Limited liability entity, consolidated, carrying amount, assets 4,187,000 26,000 25,000
Dakota Prairie Refining, LLC [Member] | Total current assets [Member]
      
Variable Interest Entities [Line Items]      
Limited liability entity, consolidated, carrying amount, assets 21,060,000 4,800,000 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 314,551,000 172,073,000 123,297,000
Dakota Prairie Refining, LLC [Member] | Total assets [Member]
      
Variable Interest Entities [Line Items]      
Limited liability entity, consolidated, carrying amount, assets 335,611,000 176,873,000 146,469,000
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 3,000,000 3,000,000
Dakota Prairie Refining, LLC [Member] | Accounts payable [Member]
      
Variable Interest Entities [Line Items]      
Limited liability entity, consolidated, carrying amount, liabilities 36,541,000 8,904,000 20,313,000
Dakota Prairie Refining, LLC [Member] | Taxes payable [Member]
      
Variable Interest Entities [Line Items]      
Limited liability entity, consolidated, carrying amount, liabilities 323,000 5,000 0
Dakota Prairie Refining, LLC [Member] | Accrued compensation [Member]
      
Variable Interest Entities [Line Items]      
Limited liability entity, consolidated, carrying amount, liabilities 617,000 26,000 0
Dakota Prairie Refining, LLC [Member] | Other accrued liabilities [Member]
      
Variable Interest Entities [Line Items]      
Limited liability entity, consolidated, carrying amount, liabilities 633,000 461,000 363,000
Dakota Prairie Refining, LLC [Member] | Total current liabilities [Member]
      
Variable Interest Entities [Line Items]      
Limited liability entity, consolidated, carrying amount, liabilities 41,114,000 12,396,000 23,676,000
Dakota Prairie Refining, LLC [Member] | Long-term debt [Member]
      
Variable Interest Entities [Line Items]      
Limited liability entity, consolidated, carrying amount, liabilities 69,000,000 72,000,000 72,000,000
Dakota Prairie Refining, LLC [Member] | Total liabilities [Member]
      
Variable Interest Entities [Line Items]      
Limited liability entity, consolidated, carrying amount, liabilities 110,114,000 84,396,000 95,676,000
Fuel contract [Member]
      
Variable Interest Entities [Line Items]      
Variable interest entity, reporting entity involvement, maximum loss exposure, amount $ 12,000,000