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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Consolidated Operating Results by Quarter | The table below sets forth the unaudited consolidated operating results by quarter for the years ended December 31, 2017 and 2016 (in thousands, except per share information).
|  | For the Three Months Ended
|  | March 31, |  | June 30, |  | September 30, |  | December 31,
2017: |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 2,178,170 |  |  | $ | 2,200,374 |  |  | $ | 2,609,307 |  |  | $ | 2,478,627 |
Gross profit |  | 266,188 |  |  | 302,165 |  |  | 350,631 |  |  | 322,876 |
Net income |  | 48,440 |  |  | 64,360 |  |  | 89,849 |  |  | 115,576 |
Net income attributable to common stock |  | 48,267 |  |  | 63,837 |  |  | 89,313 |  |  | 113,561 |
Net income from continuing operations attributable to common stock |  | 48,267 |  |  | 63,837 |  |  | 89,313 |  |  | 113,561 |
Basic earnings per share from continuing operations attributable to common stock |  | $ | 0.31 |  |  | $ | 0.41 |  |  | $ | 0.57 |  |  | $ | 0.72 |
Diluted earnings per share from continuing operations attributable to common stock |  | $ | 0.31 |  |  | $ | 0.41 |  |  | $ | 0.56 |  |  | $ | 0.72 |
2016: |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 1,713,737 |  |  | $ | 1,792,430 |  |  | $ | 2,042,186 |  |  | $ | 2,102,966 |
Gross profit |  | 203,313 |  |  | 200,217 |  |  | 302,582 |  |  | 307,688 |
Net income |  | 20,859 |  |  | 16,729 |  |  | 74,152 |  |  | 88,358 |
Net income attributable to common stock |  | 20,496 |  |  | 16,562 |  |  | 73,742 |  |  | 87,583 |
Net income from continuing operations attributable to common stock |  | 20,496 |  |  | 16,562 |  |  | 73,137 |  |  | 88,530 |
Basic earnings per share from continuing operations attributable to common stock |  | $ | 0.13 |  |  | $ | 0.11 |  |  | $ | 0.47 |  |  | $ | 0.57 |
Diluted earnings per share from continuing operations attributable to common stock |  | $ | 0.13 |  |  | $ | 0.11 |  |  | $ | 0.47 |  |  | $ | 0.57 |

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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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