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Commitments and Contingencies (Details 3) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Oct. 31, 2011
Litigation
CRRM
Dec. 31, 2011
Litigation
CRNF
year
Dec. 31, 2010
Litigation
CRNF
Dec. 31, 2009
Litigation
CRNF
Dec. 31, 2008
Litigation
CRNF
May 31, 2010
Litigation
Oklahoma and Kansas
CRRM
lawsuit
Jun. 30, 2010
Flood, Crude Oil Discharge and Insurance
Oct. 31, 2009
Flood, Crude Oil Discharge and Insurance
plaintiff
May 31, 2008
Flood, Crude Oil Discharge and Insurance
claimant
Dec. 31, 2011
Flood, Crude Oil Discharge and Insurance
Oct. 25, 2010
Flood, Crude Oil Discharge and Insurance
Dec. 31, 2011
EHS
landfill
Dec. 31, 2010
EHS
landfill
Feb. 24, 2010
EHS
Feb. 28, 2010
EHS
CRRM
month
Dec. 31, 2011
EHS
CRRM
Mar. 31, 2004
EHS
CRRM and CRT
Mar. 31, 2004
EHS
CRRM and CRT
Feb. 28, 2010
EHS
Maximum
year
Feb. 28, 2010
EHS
Minimum
year
Commitments and Contingencies                                              
Number of lawsuits filed                 2                            
Property tax abatement period (in years)         10                                    
Increase in property tax expenses         $ 11,400,000 $ 11,700,000 $ 10,700,000 $ 10,700,000                              
Increase in expenses related to use of inbound and outbound lines       14,750,000                                      
Number of private claimants                       16                      
Aggregate amount of claims                   3,200,000 3,200,000 4,400,000                      
Number of additional plaintiffs                     3                        
Reimbursement of oversight cost                           1,800,000                  
Insurance proceeds under primary environmental liability insurance policy   3,161,000                     25,000,000                    
Environmental, Health, and Safety ("EHS") Matters                                              
Environmental accruals                             1,900,000 4,100,000              
Environmental accruals included in other current liabilities                             500,000 1,500,000              
Estimated closure and post-closure costs                             900,000 900,000              
Number of landfills                             2 2              
Estimated future payments for environmental obligations                                              
2012                             493,000                
2013                             166,000                
2014                             166,000                
2015                             166,000                
2016                             109,000                
Thereafter                             1,077,000                
Undiscounted total                             2,177,000                
Less amounts representing interest at 1.69%                             225,000                
Accrued environmental liabilities at the end of the year                             1,952,000                
Interest rate (as a percent)                             1.69%                
Expenses related to environmental, health and safety ("EHS") matters 7,600,000 13,700,000 24,400,000                                        
Remaining amount expected to be spent for environmental remediation compliance, including capital expenditures                                       49,000,000      
Expected capital expenditures related to environmental, health and safety ("EHS") matters                                     10,000,000   47,000,000    
Renewable fuel as percentage of all fuel used as required by the EPA under the Renewable Fuel Standard                                     8.00%        
Proposed renewable fuel as percentage of all fuel used in 2012 under the EPA's Renewable Fuel Standard                                     9.00%        
Expense associated with the purchasing of Renewable Identification Numbers                                     19,000,000        
Extension period for installation of controls (in months)                                   15          
Period over which incremental capital expenditure not material and limited primarily to retrofit and replacement of heaters and boilers (in years)                                           7 5
Environmental civil penalty                                 $ 900,000