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Quarterly Financial Information (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Summary of Quarterly Financial Information | (in thousands, except per share amounts)
|  | Quarter Ended |
|  | March 31 |  |  | June 30 |  |  | September 30 |  |  | December 31 |
Year ended December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 218,215 |  |  | $ | 230,982 |  |  | $ | 247,962 |  |  | $ | 245,152 |
Cost of revenues |  |  | 189,868 |  |  |  | 175,863 |  |  |  | 177,198 |  |  |  | 191,129 |
Gross margin |  |  | 28,347 |  |  |  | 55,119 |  |  |  | 70,764 |  |  |  | 54,023 |
Net (loss) income |  |  | (2,300 | ) |  |  | 13,907 |  |  |  | 24,971 |  |  |  | 11,714 |
Basic (loss) income per common share |  |  | (0.31 | ) |  |  | 1.88 |  |  |  | 3.34 |  |  |  | 1.57 |
Diluted (loss) income per common share |  |  | (0.31 | ) |  |  | 1.81 |  |  |  | 3.24 |  |  |  | 1.51 |
Year ended December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 223,975 |  |  | $ | 231,603 |  |  | $ | 247,287 |  |  | $ | 237,832 |
Cost of revenues |  |  | 207,713 |  |  |  | 183,123 |  |  |  | 187,602 |  |  |  | 175,588 |
Gross margin |  |  | 16,262 |  |  |  | 48,480 |  |  |  | 59,685 |  |  |  | 62,244 |
Net (loss) income |  |  | (9,123 | ) |  |  | 11,240 |  |  |  | 19,087 |  |  |  | 16,856 |
Basic (loss) income per common share |  |  | (1.25 | ) |  |  | 1.54 |  |  |  | 2.59 |  |  |  | 2.28 |
Diluted (loss) income per common share |  |  | (1.25 | ) |  |  | 1.46 |  |  |  | 2.50 |  |  |  | 2.21 |

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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=118952077&loc=d3e1280-108306 + Details
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