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Supplemental Quarterly Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]                      
Sales and other operating revenues $ 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
Income from continuing operations before income taxes 44,500 94,100 38,800 40,900 141,800 91,000 93,900 12,600 218,289 339,346 254,194
Income from continuing operations 29,200 60,000 24,800 23,600 94,400 56,600 64,400 7,600 137,591 222,960 154,135
Net income $ 66,700 $ 60,500 $ 26,200 $ 22,900 $ 98,400 $ 62,700 $ 73,200 $ 9,600 $ 176,340 $ 243,863 $ 235,033
Income from continuing operations (per Common share)                      
Income from continuing operations - basic (in dollars per share) $ 0.70 $ 1.41 $ 0.56 $ 0.52 $ 2.06 $ 1.24 $ 1.39 $ 0.16 $ 3.17 $ 4.84 $ 3.30
Income from continuing operations - diluted (in dollars per share) 0.69 1.40 0.56 0.51 2.04 1.23 1.38 0.16 3.14 4.81 3.29
Net income (per Common share)                      
Net income - basic (in dollars per share) 1.60 1.42 0.59 0.50 2.15 1.35 1.58 0.21 4.06 5.29 5.03
Net income - diluted (in dollars per share) 1.58 1.41 0.59 0.50 2.13 1.35 1.57 0.21 4.02 5.26 $ 5.02
Market price of Common stock                      
High (in dollars per share) 65.09 57.40 73.47 73.48 69.37 55.64 52.34 43.25 73.48 69.37  
Low (in dollars per share) $ 54.17 $ 48.70 $ 55.82 $ 66.82 $ 49.63 $ 47.26 $ 39.96 $ 37.55 $ 48.70 $ 37.55