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Commitments and Contingencies (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Loss Contingencies [Line Items]        
Environmental Remediation Expense $ 4,100,000      
Maximum Exposure for Environmental Remediation under Omnibus Agreement 250,000      
Recorded Related Party Environmental Recoveries Receivable 3,850,000   3,850,000  
Environmental Recoveries Reimbursed under Omnibus Agreement     750,000  
Letters of Credit Outstanding, Amount 11,500,000   11,500,000  
Operating Leases, Rent Expense 100,000 100,000 200,000 200,000
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