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Summary of Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Consolidated Statements of Income by Quarter | The following table summarizes Sonic’s results of operations as presented in the accompanying consolidated statements of income by quarter for 2017 and 2016:
|  | First Quarter |  |  | Second Quarter |  |  | Third Quarter |  |  | Fourth Quarter |
|  | (In thousands, except per share data) |
Year Ended December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues (1) |  | $ | 2,287,822 |  |  | $ | 2,405,746 |  |  | $ | 2,505,701 |  |  | $ | 2,667,939 |
Gross profit (1) |  | $ | 350,346 |  |  | $ | 360,618 |  |  | $ | 362,622 |  |  | $ | 384,090 |
Net income (loss) (2) |  | $ | (541 | ) |  | $ | 12,132 |  |  | $ | 19,440 |  |  | $ | 61,952 |
Earnings (loss) per common share - Basic (2) (3) |  | $ | (0.01 | ) |  | $ | 0.27 |  |  | $ | 0.45 |  |  | $ | 1.43 |
Earnings (loss) per common share - Diluted (2) (3) |  | $ | (0.01 | ) |  | $ | 0.27 |  |  | $ | 0.44 |  |  | $ | 1.42 |
Year Ended December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues (1) |  | $ | 2,234,626 |  |  | $ | 2,382,312 |  |  | $ | 2,557,928 |  |  | $ | 2,556,913 |
Gross profit (1) |  | $ | 345,150 |  |  | $ | 353,305 |  |  | $ | 359,085 |  |  | $ | 371,734 |
Net income (loss) (2) |  | $ | 14,624 |  |  | $ | 22,822 |  |  | $ | 18,111 |  |  | $ | 37,636 |
Earnings (loss) per common share - Basic (2) (3) |  | $ | 0.31 |  |  | $ | 0.50 |  |  | $ | 0.40 |  |  | $ | 0.84 |
Earnings (loss) per common share - Diluted (2) (3) |  | $ | 0.31 |  |  | $ | 0.50 |  |  | $ | 0.40 |  |  | $ | 0.83 |
(1) | Results are for continuing operations.
(2) | Results include both continuing operations and discontinued operations.
(3) | The sum of net income per common share for the quarters may not equal the full year amount due to weighted average common shares being calculated on a quarterly versus annual basis.

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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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