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Selected Quarterly Financial Information (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Selected Quarterly Financial Information | The following table presents selected quarterly financial information:
| Year Ended December 31, 2017
(In thousands, except per share data) | First |  | Second |  | Third |  | Fourth |  | Year
Summary Operating Results: |  |  |  |  |  |  |  |  |
Total revenues | $ | 610,065 |  |  | $ | 604,124 |  |  | $ | 591,542 |  |  | $ | 595,088 |  |  | $ | 2,400,819 |
Operating income | 94,830 |  |  | 89,554 |  |  | 78,940 |  |  | 80,477 |  |  | 343,801 |
Income from continuing operations, net of tax | $ | 35,076 |  |  | $ | 27,692 |  |  | $ | 23,157 |  |  | $ | 82,073 |  |  | $ | 167,998 |
Income from discontinued operations, net of tax | 375 |  |  | 21,017 |  |  | — |  |  | — |  |  | 21,392 |
Net income | $ | 35,451 |  |  | $ | 48,709 |  |  | $ | 23,157 |  |  | $ | 82,073 |  |  | $ | 189,390 |
Basic net income per common share: |  |  |  |  |  |  |  |  |
Continuing operations | $ | 0.31 |  |  | $ | 0.24 |  |  | $ | 0.20 |  |  | $ | 0.72 |  |  | $ | 1.46 |
Discontinued operations | — |  |  | 0.18 |  |  | — |  |  | — |  |  | 0.19 |
Basic net income per common share | $ | 0.31 |  |  | $ | 0.42 |  |  | $ | 0.20 |  |  | $ | 0.72 |  |  | $ | 1.65 |
Diluted net income per common share: |  |  |  |  |  |  |  |  |
Continuing operations | $ | 0.31 |  |  | $ | 0.24 |  |  | $ | 0.20 |  |  | $ | 0.71 |  |  | $ | 1.45 |
Discontinued operations | — |  |  | 0.18 |  |  | — |  |  | — |  |  | 0.19 |
Diluted net income per common share | $ | 0.31 |  |  | $ | 0.42 |  |  | $ | 0.20 |  |  | $ | 0.71 |  |  | $ | 1.64 |
| Year Ended December 31, 2016
(In thousands, except per share data) | First |  | Second |  | Third |  | Fourth |  | Year
Summary Operating Results: |  |  |  |  |  |  |  |  |
Total revenues | $ | 556,653 |  |  | $ | 548,784 |  |  | $ | 535,173 |  |  | $ | 558,649 |  |  | $ | 2,199,259 |
Operating income | 82,362 |  |  | 80,439 |  |  | 67,881 |  |  | 29,726 |  |  | 260,408 |
Income from continuing operations, net of tax | $ | 21,666 |  |  | $ | 11,257 |  |  | $ | 164,197 |  |  | $ | 10,581 |  |  | $ | 207,701 |
Income from discontinued operations, net of tax | 11,630 |  |  | 18,715 |  |  | 180,707 |  |  | 1,478 |  |  | 212,530 |
Net income | $ | 33,296 |  |  | $ | 29,972 |  |  | $ | 344,904 |  |  | $ | 12,059 |  |  | $ | 420,231 |
Basic net income per common share: |  |  |  |  |  |  |  |  |
Continuing operations | $ | 0.19 |  |  | $ | 0.10 |  |  | $ | 1.43 |  |  | $ | 0.09 |  |  | $ | 1.81 |
Discontinued operations | 0.10 |  |  | 0.16 |  |  | 1.58 |  |  | 0.01 |  |  | 1.86 |
Basic net income per common share | $ | 0.29 |  |  | $ | 0.26 |  |  | $ | 3.01 |  |  | $ | 0.10 |  |  | $ | 3.67 |
Diluted net income per common share: |  |  |  |  |  |  |  |  |
Continuing operations | $ | 0.19 |  |  | $ | 0.10 |  |  | $ | 1.43 |  |  | $ | 0.09 |  |  | $ | 1.80 |
Discontinued operations | 0.10 |  |  | 0.16 |  |  | 1.57 |  |  | 0.01 |  |  | 1.85 |
Diluted net income per common share | $ | 0.29 |  |  | $ | 0.26 |  |  | $ | 3.00 |  |  | $ | 0.10 |  |  | $ | 3.65 |

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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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