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Business Segments (Summary of Information by Business Segment) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Sep. 30, 2015
segment
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Segment Reporting [Abstract]                        
Number of operating segments | segment                 1      
Segment Reporting Information [Line Items]                        
Net income $ 66,700 $ 60,500 $ 26,200 $ 22,900 $ 98,400 $ 62,700 $ 73,200 $ 9,600   $ 176,340 $ 243,863 $ 235,033
Revenues from external customers 2,928,200 $ 3,382,500 $ 3,468,000 $ 2,920,700 3,554,000 $ 4,622,600 $ 4,693,900 $ 4,115,500   12,699,411 16,986,014 17,814,081
Interest income                   2,177 244 1,099
Interest expense                   (33,531) (36,646) (14,509)
Income tax expense (benefit)                   80,698 116,386 100,059
Depreciation and amortization                   86,568 79,087 74,053
Accretion of asset retirement obligations                   1,521 1,200 1,096
Deferred and noncurrent income taxes (benefits)                   40,556 (4,403) (11,568)
Additions to property, plant and equipment                   215,568 138,888 171,972
Total assets at year-end 1,886,241       1,949,337         1,886,241 1,949,337 1,888,564
Segment Discontinued Operations [Member]                        
Segment Reporting Information [Line Items]                        
Net income                   38,749 20,903 80,898
Revenues from external customers                   0 0 0
Interest income                   0 0 0
Interest expense                   0 0 0
Income tax expense (benefit)                   0 0 0
Depreciation and amortization                   0 0 0
Accretion of asset retirement obligations                   0 0 0
Deferred and noncurrent income taxes (benefits)                   0 0 0
Additions to property, plant and equipment                   3,720 3,549 1,752
Total assets at year-end 0       56,328         0 56,328 41,158
Operating Segments [Member] | Marketing [Member] | Segment Continuing Operations [Member]                        
Segment Reporting Information [Line Items]                        
Net income                   159,796 242,434 164,013
Revenues from external customers                   12,699,125 16,985,903 17,814,081
Interest income                   0 0 0
Interest expense                   (20) 0 0
Income tax expense (benefit)                   95,657 127,657 106,223
Depreciation and amortization                   81,349 74,906 71,253
Accretion of asset retirement obligations                   1,521 1,200 1,096
Deferred and noncurrent income taxes (benefits)                   42,593 368 (9,796)
Additions to property, plant and equipment                   202,371 131,139 162,051
Total assets at year-end 1,727,131       1,544,018         1,727,131 1,544,018 1,527,125
Corporate, Non-Segment [Member] | Segment Continuing Operations [Member]                        
Segment Reporting Information [Line Items]                        
Net income                   (22,205) (19,474) (9,878)
Revenues from external customers                   286 111 0
Interest income                   2,177 244 1,099
Interest expense                   (33,511) (36,646) (14,509)
Income tax expense (benefit)                   (14,959) (11,271) (6,164)
Depreciation and amortization                   5,219 4,181 2,800
Accretion of asset retirement obligations                   0 0 0
Deferred and noncurrent income taxes (benefits)                   (2,037) (4,771) (1,772)
Additions to property, plant and equipment                   9,477 4,200 8,169
Total assets at year-end $ 159,110       $ 348,991         $ 159,110 $ 348,991 $ 320,281