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Selected Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Summary of Selected Quarterly Financial Data | The following table sets forth the selected quarterly financial data for each of the quarters in 2018 (in thousands, except per share amounts):
| Quarter Ended |
| March 31, |  |  | June 30, |  |  | September 30, |  |  | December 31, |
| 2018 |  |  | 2018 |  |  | 2018 |  |  | 2018 |
Year Ended December 31, 2018: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ | 837,342 |  |  | $ | 894,734 |  |  | $ | 933,224 |  |  | $ | 1,018,293 |
Gross margin |  | 91,039 |  |  |  | 100,991 |  |  |  | 114,984 |  |  |  | 138,587 |
Operating income |  | 16,535 |  |  |  | 25,406 |  |  |  | 34,734 |  |  |  | 48,244 |
Income from continuing operations before provision for income taxes |  | 14,393 |  |  |  | 23,051 |  |  |  | 32,914 |  |  |  | 46,367 |
Income from continuing operations |  | 11,069 |  |  |  | 17,154 |  |  |  | 25,764 |  |  |  | 33,674 |
Income from discontinued operations, net of income taxes |  | 5,099 |  |  |  | 4,897 |  |  |  | 88,846 |  |  |  | 15,237 |
Net income |  | 16,168 |  |  |  | 22,051 |  |  |  | 114,610 |  |  |  | 48,911 |
Earnings per share from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic | $ | 0.33 |  |  | $ | 0.51 |  |  | $ | 0.77 |  |  | $ | 1.01 |
Diluted | $ | 0.33 |  |  | $ | 0.51 |  |  | $ | 0.77 |  |  | $ | 1.01 |
Earnings per share from discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic | $ | 0.15 |  |  | $ | 0.15 |  |  | $ | 2.66 |  |  | $ | 0.45 |
Diluted | $ | 0.15 |  |  | $ | 0.15 |  |  | $ | 2.64 |  |  | $ | 0.45 |
Earnings per share from net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic | $ | 0.48 |  |  | $ | 0.66 |  |  | $ | 3.43 |  |  | $ | 1.46 |
Diluted | $ | 0.48 |  |  | $ | 0.66 |  |  | $ | 3.41 |  |  | $ | 1.46 |
The following table sets forth the selected quarterly financial data for each of the quarters in 2017 (in thousands, except per share amounts):
| Quarter Ended |
| March 31, |  |  | June 30, |  |  | September 30, |  |  | December 31, |
| 2017 |  |  | 2017 |  |  | 2017 |  |  | 2017 |
Year Ended December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ | 680,443 |  |  | $ | 708,572 |  |  | $ | 824,809 |  |  | $ | 909,239 |
Gross margin |  | 71,791 |  |  |  | 72,906 |  |  |  | 86,327 |  |  |  | 106,606 |
Operating income |  | 11,313 |  |  |  | 10,465 |  |  |  | 15,824 |  |  |  | 35,067 |
Income from continuing operations before provision for income taxes |  | 10,511 |  |  |  | 9,605 |  |  |  | 13,877 |  |  |  | 32,938 |
Income from continuing operations |  | 6,543 |  |  |  | 5,724 |  |  |  | 11,665 |  |  |  | 96,082 |
Income from discontinued operations, net of income taxes |  | 3,791 |  |  |  | 3,818 |  |  |  | 3,669 |  |  |  | 3,861 |
Net income |  | 10,334 |  |  |  | 9,542 |  |  |  | 15,334 |  |  |  | 99,943 |
Earnings per share from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic | $ | 0.20 |  |  | $ | 0.17 |  |  | $ | 0.35 |  |  | $ | 2.89 |
Diluted | $ | 0.20 |  |  | $ | 0.17 |  |  | $ | 0.35 |  |  | $ | 2.87 |
Earnings per share from discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic | $ | 0.11 |  |  | $ | 0.12 |  |  | $ | 0.11 |  |  | $ | 0.12 |
Diluted | $ | 0.11 |  |  | $ | 0.12 |  |  | $ | 0.11 |  |  | $ | 0.12 |
Earnings per share from net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic | $ | 0.31 |  |  | $ | 0.29 |  |  | $ | 0.46 |  |  | $ | 3.01 |
Diluted | $ | 0.31 |  |  | $ | 0.29 |  |  | $ | 0.46 |  |  | $ | 2.99 |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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