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Commitments and Contingencies (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Loss Contingencies [Line Items]  
Environmental Remediation Expense $ 4,500,000
Maximum Exposure for Environmental Remediation under Omnibus Agreement 1,000,000
Maximum Remediation Recoveries per Event under Omnibus Agreement 20,000,000
Recorded Related Party Environmental Recoveries Receivable 3,500,000
Letters of Credit Outstanding, Amount 11,500,000
Operating Leases, Rent Expense 100,000
Operating Leases, rent expense, Related Party $ 0
East Houston Contract [Member]
  
Loss Contingencies [Line Items]  
Maximum Purchases under Supply Contract 7,000
Abilene Contract [Member]
  
Loss Contingencies [Line Items]  
Maximum Purchases under Supply Contract 20,350