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Business Segments (Summary of Information by Business Segment) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
segment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Segment Reporting [Abstract]      
Number of operating segments | segment 1    
Segment Reporting Information [Line Items]      
Segment income (loss) $ 386,100 $ 154,800 $ 213,600
Revenues from external customers 11,264,300 14,034,600 14,362,900
Interest income 1,000 3,200 1,500
Interest expense (51,200) (54,900) (52,900)
Loss on early debt extinguishment 0 (14,800) 0
Income tax expense (benefit) 123,000 47,600 60,300
Significant noncash charges (credits)      
Depreciation and amortization 161,000 152,200 134,000
Accretion of asset retirement obligations 2,300 2,100 2,000
Debt extinguishment costs 0 4,400  
Deferred and noncurrent income taxes (benefits) 2,500 23,700 37,900
Additions to property, plant and equipment 227,100 214,600 193,800
Total assets at year-end 2,685,700 2,687,200 2,360,800
Operating Segment | Marketing      
Segment Reporting Information [Line Items]      
Segment income (loss) 442,200 215,000 214,200
Revenues from external customers 11,264,000 14,034,300 14,362,300
Interest income 0 0 0
Interest expense (100) (100) (100)
Loss on early debt extinguishment 0 0  
Income tax expense (benefit) 132,900 66,300 69,500
Significant noncash charges (credits)      
Depreciation and amortization 146,300 138,900 124,500
Accretion of asset retirement obligations 2,300 2,100 2,000
Debt extinguishment costs 0 0  
Deferred and noncurrent income taxes (benefits) 2,800 32,900 39,000
Additions to property, plant and equipment 200,800 155,500 169,200
Total assets at year-end 2,418,200 2,304,700 2,012,000
Corporate and Other Assets      
Segment Reporting Information [Line Items]      
Segment income (loss) (56,100) (60,200) (600)
Revenues from external customers 300 300 600
Interest income 1,000 3,200 1,500
Interest expense (51,100) (54,800) (52,800)
Loss on early debt extinguishment 0 (14,800)  
Income tax expense (benefit) (9,900) (18,700) (9,200)
Significant noncash charges (credits)      
Depreciation and amortization 14,700 13,300 9,500
Accretion of asset retirement obligations 0 0 0
Debt extinguishment costs 0 4,400  
Deferred and noncurrent income taxes (benefits) (300) (9,200) (1,100)
Additions to property, plant and equipment 26,300 59,100 24,600
Total assets at year-end $ 267,500 $ 382,500 $ 348,800