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Quarterly Financial Information (Unaudited)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information (Unaudited)
Quarterly Financial Information (Unaudited)
 
Offshore marine construction activities may fluctuate as a result of weather conditions as well as the timing of capital expenditures by oil and gas companies. Historically, a substantial portion of our services has been performed during the summer and fall months. As a result, historically 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,
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

 
Quarter Ended
 
March 31,
 
June 30,
 
September 30,
 
December 31,
2016
 
 
 
 
 
 
 
Net revenues
$
91,039

 
$
107,267

 
$
161,245

 
$
128,031

Gross profit (loss)
(16,930
)
 
5,658

 
40,184

 
17,604

Net income (loss) (2)
(27,823
)
 
(10,671
)
 
11,462

 
(54,413
)
Basic earnings (loss) per common share
$
(0.26
)
 
$
(0.10
)
 
$
0.10

 
$
(0.46
)
Diluted earnings (loss) per common share
$
(0.26
)
 
$
(0.10
)
 
$
0.10

 
$
(0.46
)

(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.
(2)
Amount in the fourth quarter of 2016 included a $45.1 million goodwill impairment charge related to our robotics reporting unit (Note 2).