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Quarterly Financial Information (in thousands, except per share amounts) (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2011
Quarterly Financial Information |
18. | Quarterly Financial Information (in thousands, except per share amounts) (unaudited)
|  | 1st Quarter |  |  | 2nd Quarter |  |  | 3rd Quarter |  |  | 4th Quarter |
2010 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $ | 271,598 |  |  | $ | 306,992 |  |  | $ | 378,663 |  |  | $ | 505,678 |
Operating income |  |  | 7,831 |  |  |  | 45,757 |  |  |  | 52,509 |  |  |  | 94,828 |
Income from continuing operations, net of income taxes |  |  | 4,186 |  |  |  | 29,528 |  |  |  | 29,374 |  |  |  | 54,810 |
Loss from discontinued operations, net of income taxes |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (956 | )
Net income |  |  | 4,186 |  |  |  | 29,528 |  |  |  | 29,374 |  |  |  | 53,854 |
Basic income (loss) per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
From continuing operations |  | $ | 0.03 |  |  | $ | 0.19 |  |  | $ | 0.19 |  |  | $ | 0.36 |
From discontinued operations |  | $ | 0.00 |  |  | $ | 0.00 |  |  | $ | 0.00 |  |  | $ | (0.01 | )
Net income |  | $ | 0.03 |  |  | $ | 0.19 |  |  | $ | 0.19 |  |  | $ | 0.35 |
Diluted income (loss) per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
From continuing operations |  | $ | 0.03 |  |  | $ | 0.19 |  |  | $ | 0.19 |  |  | $ | 0.35 |
From discontinued operations |  | $ | 0.00 |  |  | $ | 0.00 |  |  | $ | 0.00 |  |  | $ | (0.01 | )
Net income |  | $ | 0.03 |  |  | $ | 0.19 |  |  | $ | 0.19 |  |  | $ | 0.35 |
2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $ | 567,404 |  |  | $ | 600,064 |  |  | $ | 673,828 |  |  | $ | 724,647 |
Operating income |  |  | 117,547 |  |  |  | 131,860 |  |  |  | 132,294 |  |  |  | 143,900 |
Income from continuing operations, net of income taxes |  |  | 71,619 |  |  |  | 81,638 |  |  |  | 81,928 |  |  |  | 87,595 |
Loss from discontinued operations, net of income taxes |  |  | (367 | ) |  |  | — |  |  |  | — |  |  |  | — |
Net income |  |  | 71,252 |  |  |  | 81,638 |  |  |  | 81,928 |  |  |  | 87,595 |
Basic income (loss) per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
From continuing operations |  | $ | 0.46 |  |  | $ | 0.53 |  |  | $ | 0.53 |  |  | $ | 0.56 |
From discontinued operations |  | $ | 0.00 |  |  | $ | 0.00 |  |  | $ | 0.00 |  |  | $ | 0.00 |
Net income |  | $ | 0.46 |  |  | $ | 0.53 |  |  | $ | 0.53 |  |  | $ | 0.56 |
Diluted income (loss) per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
From continuing operations |  | $ | 0.46 |  |  | $ | 0.52 |  |  | $ | 0.53 |  |  | $ | 0.56 |
From discontinued operations |  | $ | 0.00 |  |  | $ | 0.00 |  |  | $ | 0.00 |  |  | $ | 0.00 |
Net income |  | $ | 0.46 |  |  | $ | 0.52 |  |  | $ | 0.53 |  |  | $ | 0.56

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 270 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (a)-(j) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6952194&loc=d3e1280-108306 + Details
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