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Quarterly Financial Information (Tables) | 12 Months Ended
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Dec. 31, 2012
Summary Of Unaudited Quarterly Financial Information |
|  | 1st Quarter |  |  | 2nd Quarter |  |  | 3rd Quarter |  |  | 4th Quarter |
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 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 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 |
2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $ | 745,921 |  |  | $ | 681,112 |  |  | $ | 643,631 |  |  | $ | 652,750 |
Operating income |  |  | 157,664 |  |  |  | 150,894 |  |  |  | 88,594 |  |  |  | 100,209 |
Income from continuing operations, net of income taxes |  |  | 97,274 |  |  |  | 92,538 |  |  |  | 50,806 |  |  |  | 58,859 |
Loss from discontinued operations, net of income taxes |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Net income |  |  | 97,274 |  |  |  | 92,538 |  |  |  | 50,806 |  |  |  | 58,859 |
Basic income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
From continuing operations |  | $ | 0.62 |  |  | $ | 0.60 |  |  | $ | 0.34 |  |  | $ | 0.40 |
From discontinued operations |  | $ | 0.00 |  |  | $ | 0.00 |  |  | $ | 0.00 |  |  | $ | 0.00 |
Net income |  | $ | 0.62 |  |  | $ | 0.60 |  |  | $ | 0.34 |  |  | $ | 0.40 |
Diluted income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
From continuing operations |  | $ | 0.62 |  |  | $ | 0.60 |  |  | $ | 0.33 |  |  | $ | 0.40 |
From discontinued operations |  | $ | 0.00 |  |  | $ | 0.00 |  |  | $ | 0.00 |  |  | $ | 0.00 |
Net income |  | $ | 0.62 |  |  | $ | 0.60 |  |  | $ | 0.33 |  |  | $ | 0.40 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=20225539&loc=d3e1280-108306 + Details
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