Quarterly report pursuant to Section 13 or 15(d)

Quarterly Financial Information (Unaudited) (Details)

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Quarterly Financial Information (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Selected Quarterly Financial Information [Abstract]        
Total operating revenues $ 762,490 $ 384,522 $ 1,242,035 $ 833,120
Total operating expenses 381,091 161,914 970,018 410,595
Operating income (loss) 381,399 222,608 272,017 422,525
Income (loss) from continuing operations 203,909 117,794 64,655 200,990
Income (loss) from discontinued operations   3,100 2,210 3,100
Net income (loss) $ 203,909 $ 120,894 $ 66,865 $ 204,090
Earnings (loss) per common share - basic:        
Continuing operations - basic $ 0.78 $ 0.45 $ 0.25 $ 0.77
Discontinued operations - basic   $ 0.01 $ 0.01 $ 0.01
Net income (loss) - basic $ 0.78 $ 0.46 $ 0.26 $ 0.78
Earnings (loss) per share - diluted:        
Continuing operations - diluted $ 0.78 $ 0.45 $ 0.25 $ 0.77
Discontinued operations - diluted   $ 0.01 $ 0.01 $ 0.01
Net income (loss) - diluted $ 0.78 $ 0.46 $ 0.26 $ 0.78