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Commitments and Contingencies (Details 2) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended 1 Months Ended 6 Months Ended 12 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 12 Months Ended 1 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 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
Jun. 30, 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
Jun. 30, 2012
Litigation
Oklahoma
CRRM
lawsuit
Jun. 30, 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
Jun. 30, 2012
Flood, Crude Oil Discharge and Insurance
plaintiff
Oct. 25, 2010
Flood, Crude Oil Discharge and Insurance
Oct. 31, 2010
Flood, Crude Oil Discharge and Insurance
Minimum
Jun. 30, 2012
EHS
landfill
Dec. 31, 2011
EHS
landfill
Feb. 24, 2010
EHS
Mar. 31, 2012
EHS
CRRM
Mar. 01, 2010
EHS
CRRM
month
Jun. 30, 2012
EHS
CRRM
issue
Dec. 31, 2011
EHS
CRRM
Jun. 30, 2012
EHS
WRC
Feb. 28, 2010
EHS
Maximum
year
Sep. 30, 2011
EHS
Minimum
Feb. 28, 2010
EHS
Minimum
year
Jun. 30, 2012
MSAT II
CRRM and CRT
Jun. 30, 2012
MSAT II
WRC
Jun. 30, 2012
Goldman Sachs Tender Offer Dispute
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                                 18,500,000
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                                               1,800,000 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                                                                          
Six months ending December 31, 2012                                               281,000                          
2013                                               179,000                          
2014                                               162,000                          
2015                                               163,000                          
2016                                               106,000                          
Thereafter                                               1,059,000                          
Undiscounted total                                               1,950,000                          
Less amounts representing interest at 1.58%                                               198,000                          
Accrued environmental liabilities at the end of the year                                               1,752,000                          
Interest rate (as a percent)                                               1.58%                          
Remaining amount expected to be spent for environmental remediation compliance, including capital expenditures                                                                     45,000,000 49,000,000  
Expenses related to environmental, health and safety ("EHS") matters 8,100,000 900,000 11,000,000 2,500,000                                                                  
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                    
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