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Income Taxes (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Current                      
Federal                 $ 141,305,000 $ 13,434,000 $ 33,651,000
State                 7,972,000 1,262,000 2,866,000
Total current                 149,277,000 14,696,000 36,517,000
Deferred                      
Federal                 40,350,000 808,000 (6,613,000)
State                 19,936,000 (1,721,000) (669,000)
Total deferred                 60,286,000 (913,000) (7,282,000)
Total income tax expense 37,103,000 68,603,000 76,738,000 27,119,000 8,981,000 12,932,000 (425,000) (7,705,000) 209,563,000 13,783,000 29,235,000
Statutory federal income tax rate (as a percent)                 35.00%    
Reconciliation of total income tax expense (benefit) to income tax expense (benefit) computed by applying the statutory federal income tax rate (35%) to pre-tax income (loss)                      
Tax computed at federal statutory rate                 205,843,000 9,826,000 34,506,000
State income taxes, net of federal tax benefit                 20,600,000 1,923,000 5,402,000
State tax incentives, net of federal tax expense                 (3,174,000) (2,382,000) (3,205,000)
Domestic production activities deduction                 (10,562,000) (2,025,000) (3,798,000)
Federal tax credit for production of ultra-low sulfur diesel fuel                     (4,783,000)
Non-deductible share-based compensation                 2,000,000 6,747,000 1,457,000
IRS interest (income)/expense, net                 34,000 (814,000)  
Noncontrolling interest                 (11,474,000)    
Partnership basis adjustment                 4,174,000    
Other, net                 2,122,000 508,000 (344,000)
Total income tax expense 37,103,000 68,603,000 76,738,000 27,119,000 8,981,000 12,932,000 (425,000) (7,705,000) 209,563,000 13,783,000 29,235,000
Deferred income tax assets:                      
Allowance for doubtful accounts 475,000       286,000       475,000 286,000  
Personnel accruals 6,437,000       10,389,000       6,437,000 10,389,000  
Inventories 2,097,000       469,000       2,097,000 469,000  
Unrealized derivative losses, net         1,604,000         1,604,000  
Low sulfur diesel fuel credit carry forward and other general business credit carryforward         23,653,000         23,653,000  
Accrued expenses 101,000       199,000       101,000 199,000  
State tax credit carryforward, net of federal expense 17,682,000       29,955,000       17,682,000 29,955,000  
Deferred financing 76,000       101,000       76,000 101,000  
Other 2,695,000       3,018,000       2,695,000 3,018,000  
Total gross deferred income tax assets 29,563,000       69,674,000       29,563,000 69,674,000  
Deferred income tax liabilities:                      
Unrealized derivative gains, net (31,990,000)               (31,990,000)    
Property, plant, and equipment (224,452,000)       (323,839,000)       (224,452,000) (323,839,000)  
Investment in Partnership (134,920,000)               (134,920,000)    
Prepaid expenses (4,945,000)       (1,427,000)       (4,945,000) (1,427,000)  
Total gross deferred income tax liabilities (396,307,000)       (325,266,000)       (396,307,000) (325,266,000)  
Net deferred income tax liabilities (366,744,000)       (255,592,000)       (366,744,000) (255,592,000)  
Kansas state
                      
Income Tax Credit Authority [Line Items]                      
Net income tax benefit recognized from Kansas High Performance Incentive Program                 3,200,000 2,400,000 3,200,000
Kansas High Performance Incentive Program (HPIP) credits for qualified business facility investment earned                 $ 4,900,000 $ 3,700,000 $ 4,900,000