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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information [Table Text Block] | ## The following table presents the unaudited consolidated operating results by quarter for the years ended December 31, 2017 and 2016:
|  | For the Three Months Ended
(in thousands, except per share data) |  | March 31, |  | June 30, |  | September 30, |  | December 31,(a)
2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 300,129 |  |  | $ | 356,185 |  |  | $ | 373,502 |  |  | $ | 373,501 |
Gross profit |  |  | 25,740 |  |  |  | 27,517 |  |  |  | 34,853 |  |  |  | 36,894 |
Net income |  |  | 1,200 |  |  |  | 1,230 |  |  |  | 5,145 |  |  |  | 13,579 |
Basic earnings per share |  | $ | 0.07 |  |  | $ | 0.08 |  |  | $ | 0.32 |  |  | $ | 0.83 |
Diluted earnings per share |  | $ | 0.07 |  |  | $ | 0.07 |  |  | $ | 0.31 |  |  | $ | 0.82 |
2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 253,634 |  |  | $ | 261,934 |  |  | $ | 283,259 |  |  | $ | 343,660 |
Gross profit |  |  | 27,281 |  |  |  | 31,435 |  |  |  | 34,063 |  |  |  | 41,944 |
Net income |  |  | 1,987 |  |  |  | 5,500 |  |  |  | 6,146 |  |  |  | 7,798 |
Basic earnings per share |  | $ | 0.10 |  |  | $ | 0.32 |  |  | $ | 0.39 |  |  | $ | 0.49 |
Diluted earnings per share |  | $ | 0.10 |  |  | $ | 0.31 |  |  | $ | 0.38 |  |  | $ | 0.48 |
| (a) | Results for the fourth quarter of 2017 include a net Tax Act benefit of $7.8 million, or $0.48 and $0.47 per basic and diluted share, respectively. See further discussion in Note 10 — Income Taxes to our Financial Statements.

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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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