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Commitments and Contingencies (Details 2) (USD $)
 3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 1 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
WRC
Dec. 31, 2011
WRC
year
Apr. 30, 2012
KCC and FERC
component
year
Apr. 30, 2012
MAPL
anniversary
contract
Oct. 31, 2011
Litigation
CRRM
Mar. 31, 2012
Litigation
CRNF
year
Dec. 31, 2011
Litigation
CRNF
Dec. 31, 2010
Litigation
CRNF
Dec. 31, 2009
Litigation
CRNF
Dec. 31, 2008
Litigation
CRNF
May 31, 2010
Litigation
Oklahoma and Kansas
CRRM
lawsuit
Mar. 31, 2012
Litigation
Oklahoma
CRRM
lawsuit
Mar. 31, 2012
Litigation
New Mexico
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
Mar. 31, 2012
Flood, Crude Oil Discharge and Insurance
claim
Oct. 25, 2010
Flood, Crude Oil Discharge and Insurance
Oct. 31, 2010
Flood, Crude Oil Discharge and Insurance
Minimum
Mar. 31, 2012
EHS
landfill
Dec. 31, 2011
EHS
landfill
Feb. 24, 2010
EHS
Mar. 31, 2012
EHS
CRRM
Feb. 28, 2010
EHS
CRRM
month
Mar. 31, 2012
EHS
CRRM
issues
Dec. 31, 2011
EHS
CRRM
Mar. 31, 2012
EHS
WRC
Feb. 28, 2010
EHS
Maximum
year
Sep. 30, 2011
EHS
Minimum
Feb. 28, 2010
EHS
Minimum
year
Commitments and Contingencies                                                                
Number of lawsuits filed                         2 15 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                                                  
Tenure of pipeage contracts under Settlement Agreement (in years)         1                                                      
Number of components of Settlement Rates         2                                                      
Period until which third party entity would provide an estimate of pipeline integrity costs (in years)           10                                                    
Number of pipeage contracts           2                                                    
Number of private claimants                                   16                            
Aggregate amount of claims                               3,200,000 3,200,000 4,400,000                            
Number of additional plaintiffs                                 3                              
Number of claims not settled                                     1                          
Reimbursement of oversight cost                                       1,800,000                        
Anticipated civil penalties associated with the proceeding                                         100,000                   100,000  
Insurance proceeds under primary environmental liability insurance policy                                     25,000,000                          
Environmental, Health, and Safety ("EHS") Matters                                                                
Environmental accruals                                           2,000,000 1,900,000                  
Environmental accruals included in other current liabilities                                           400,000 500,000                  
Estimated closure and post-closure costs                                           900,000 900,000                  
Number of landfills                                           2 2                  
Estimated future payments for environmental obligations                                                                
Nine months ending December 31, 2012                                           374,000                    
2013                                           163,000                    
2014                                           163,000                    
2015                                           163,000                    
2016                                           163,000                    
Thereafter                                           1,064,000                    
Undiscounted total                                           2,090,000                    
Less amounts representing interest at 2.04%                                           255,000                    
Accrued environmental liabilities at the end of the year                                           1,835,000                    
Interest rate (as a percent)                                           2.04%                    
Expenses related to environmental, health and safety ("EHS") matters 2,800,000 1,600,000                                                            
Expected capital expenditures related to environmental, health and safety ("EHS") matters                                                     10,000,000   20,500,000      
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%          
Extension period for installation of controls (in months)                                                   15            
Marquee issues under the Clean Air Act                                                     4          
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                                               900,000 700,000   700,000          
Extension period for compliance with Renewable Fuel Standard if hardship relief is granted (in years)       2                                                        
Percentage of refining capacity                                                 90.00%              
Remaining costs associated with Second Consent Decree                                                 49,000,000              
Portion of remaining costs associated with Second Consent Decree to be recorded as capital expenditures                                                 47,000,000              
Estimated cost of completion of project                                                 1,200,000              
Payment of civil penalties     950,000                                                          
Costs associated with consent order other than planned costs     $ 1,500,000