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Quarterly Financial Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]  
Summary of consolidated quarterly financial information
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,
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) applicable to common shareholders (1)
(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
)
 
Quarter Ended
 
March 31,
 
June 30,
 
September 30,
 
December 31,
2015
 
 
 
 
 
 
 
Net revenues
$
189,641

 
$
166,016

 
$
182,462

 
$
157,683

Gross profit (loss) (2)
34,947

 
24,208

 
31,969

 
(324,898
)
Net income (loss) applicable to common shareholders (3)
19,642

 
(2,635
)
 
9,880

 
(403,867
)
Basic earnings (loss) per common share
$
0.19

 
$
(0.03
)
 
$
0.09

 
$
(3.83
)
Diluted earnings (loss) per common share
$
0.19

 
$
(0.03
)
 
$
0.09

 
$
(3.83
)

(1)
Amount in the fourth quarter of 2016 included a $45.1 million goodwill impairment charge related to our robotics reporting unit (Notes 2 and 6).
(2)
Amount in the fourth quarter of 2015 included impairment charges of $205.2 million for the Helix 534 and $133.4 million for the HP I and $6.3 million for certain capitalized vessel project costs (Note 4).
(3)
Amount in the fourth quarter of 2015 included a $16.4 million goodwill impairment charge related to our U.K. well intervention reporting unit (Notes 2 and 6), losses totaling $123.8 million related to our equity investments in Deepwater Gateway and Independence Hub (Note 5), and unrealized losses totaling $19.0 million on our foreign currency exchange contracts associated with the Grand Canyon, Grand Canyon II and Grand Canyon III chartered vessels (Note 18).