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Quarterly Financial Information (Tables) | 12 Months Ended
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Dec. 31, 2017
Selected Quarterly Financial Information [Abstract] |
Schedule Of Quarterly Financial Information |
|  | Quarter
(In thousands, except per share data) |  | First |  | Second |  | Third |  | Fourth |  | Total
2017 |  |  |  |  |  |  |  |  |  |
Revenue |  | $ | 754,096 |  |  | $ | 839,912 |  |  | $ | 872,987 |  |  | $ | 891,117 |  |  | $ | 3,358,112 |
Operating income |  | 108,122 |  |  | 160,432 |  |  | 163,875 |  |  | 143,457 |  |  | 575,886 |
Net income (1) |  | 65,792 |  |  | 98,418 |  |  | 102,314 |  |  | 197,250 |  |  | 463,774 |
Earnings per share: |  |  |  |  |  |  |  |  |  |
Basic |  | 0.80 |  |  | 1.20 |  |  | 1.24 |  |  | 2.40 |  |  | 5.63 |
Diluted |  | 0.80 |  |  | 1.19 |  |  | 1.24 |  |  | 2.39 |  |  | 5.63 |
Cash dividends declared |  | 0.10 |  |  | 0.10 |  |  | 0.10 |  |  | 0.10 |  |  | 0.40 |
2016 |  |  |  |  |  |  |  |  |  |
Revenue |  | $ | 707,733 |  |  | $ | 755,435 |  |  | $ | 782,611 |  |  | $ | 745,738 |  |  | $ | 2,991,517 |
Operating income |  | 99,548 |  |  | 133,436 |  |  | 137,404 |  |  | 113,447 |  |  | 483,835 |
Net income |  | 60,285 |  |  | 81,388 |  |  | 85,581 |  |  | 68,511 |  |  | 295,765 |
Earnings per share: |  |  |  |  |  |  |  |  |  |
Basic |  | 0.72 |  |  | 0.98 |  |  | 1.03 |  |  | 0.83 |  |  | 3.56 |
Diluted |  | 0.72 |  |  | 0.98 |  |  | 1.03 |  |  | 0.83 |  |  | 3.56 |
Cash dividends declared |  | — |  |  | — |  |  | — |  |  | — |  |  | — |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, 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=84173487&loc=d3e1280-108306 + Details
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