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Quarterly Financial Information (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 209,997 |  |  | $ | 225,574 |  |  | $ | 240,135 |  |  | $ | 244,726 |
Cost of revenues |  |  | 199,547 |  |  |  | 181,360 |  |  |  | 185,218 |  |  |  | 195,776 |
Gross margin |  |  | 10,450 |  |  |  | 44,214 |  |  |  | 54,917 |  |  |  | 48,950 |
Net (loss) income |  |  | (11,227 | ) |  |  | 11,126 |  |  |  | 14,785 |  |  |  | 10,486 |
Basic (loss) income per common share |  |  | (1.55 | ) |  |  | 1.53 |  |  |  | 2.03 |  |  |  | 1.44 |
Diluted (loss) income per common share |  |  | (1.55 | ) |  |  | 1.47 |  |  |  | 1.96 |  |  |  | 1.38 |
Year ended December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 190,968 |  |  | $ | 203,417 |  |  | $ | 225,103 |  |  | $ | 221,098 |
Cost of revenues |  |  | 180,581 |  |  |  | 161,164 |  |  |  | 175,544 |  |  |  | 177,761 |
Gross margin |  |  | 10,387 |  |  |  | 42,253 |  |  |  | 49,559 |  |  |  | 43,337 |
Net (loss) income |  |  | (8,003 | ) |  |  | 8,522 |  |  |  | 10,233 |  |  |  | 8,047 |
Basic (loss) income per common share |  |  | (1.11 | ) |  |  | 1.18 |  |  |  | 1.41 |  |  |  | 1.11 |
Diluted (loss) income per common share |  |  | (1.11 | ) |  |  | 1.16 |  |  |  | 1.38 |  |  |  | 1.08 |

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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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