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Quarterly Financial Information (Unaudited) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Information (Unaudited) | Quarterly Financial Information (Unaudited) In addition to being affected by the timing of oil and gas company expenditures, offshore marine construction activities may fluctuate as a result of weather conditions. Historically, a substantial portion of our services has been performed during the summer and fall months. As a result, a disproportionate portion of our revenues and net income is earned during such period. The following is a summary of consolidated quarterly financial information (in thousands, except per share amounts):
| Quarter Ended
| March 31, |  | June 30, |  | September 30, |  | December 31,
2018 |  |  |  |  |  |  |
Net revenues | $ | 164,262 |  |  | $ | 204,625 |  |  | $ | 212,575 |  |  | $ | 158,356 |
Gross profit | 12,983 |  |  | 42,897 |  |  | 51,993 |  |  | 13,811 |
Net income (loss) | (2,560 | ) |  | 17,784 |  |  | 27,121 |  |  | (13,747 | )
Basic earnings (loss) per common share | $ | (0.02 | ) |  | $ | 0.12 |  |  | $ | 0.18 |  |  | $ | (0.09 | )
Diluted earnings (loss) per common share | $ | (0.02 | ) |  | $ | 0.12 |  |  | $ | 0.18 |  |  | $ | (0.09 | )
| Quarter Ended
| March 31, |  | June 30, |  | September 30, |  | December 31,
2017 |  |  |  |  |  |  |
Net revenues | $ | 104,528 |  |  | $ | 150,329 |  |  | $ | 163,260 |  |  | $ | 163,266 |
Gross profit (loss) | (825 | ) |  | 18,367 |  |  | 21,141 |  |  | 23,483 |
Net income (loss) (1) | (16,415 | ) |  | (6,403 | ) |  | 2,290 |  |  | 50,580 |
Basic earnings (loss) per common share | $ | (0.11 | ) |  | $ | (0.04 | ) |  | $ | 0.02 |  |  | $ | 0.34 |
Diluted earnings (loss) per common share | $ | (0.11 | ) |  | $ | (0.04 | ) |  | $ | 0.02 |  |  | $ | 0.34 |
(1) | Amount in the fourth quarter of 2017 included a $51.6 million income tax benefit as a result of the U.S. tax law changes enacted in December 2017.

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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