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Quarterly information (Unaudited)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Data [Abstract]  
Quarterly information (Unaudited)
Quarterly information (Unaudited)
Financial results by quarter for the years ended December 31, 2017 and 2016 are as follows:
 
Net sales
 
Gross profit (loss)
 
Net income (loss)
 
Net income (loss) allocated to common stockholders
 
Basic
earnings (loss) per share
 
Diluted earnings (loss) per share
2017
 
 
 
 
 
 
 
 
 
 
 
4th Quarter (1)
$
433,847

 
$
47,892

 
$
35,805

 
$
32,963

 
$
0.38

 
$
0.37

3rd Quarter
400,645

 
41,402

 
20,783

 
19,132

 
0.22

 
0.22

2nd Quarter
388,802

 
22,460

 
7,131

 
6,563

 
0.08

 
0.07

1st Quarter (2)
365,786

 
16,851

 
(15,139
)
 
(15,139
)
 
(0.17
)
 
(0.17
)
2016
 

 
 

 
 

 
 

 
 

 
 
4th Quarter (3)
$
339,836

 
$
5,057

 
$
(168,464
)
 
$
(168,464
)
 
$
(1.93
)
 
$
(1.93
)
3rd Quarter (4)
333,650

 
(17,612
)
 
(58,273
)
 
(58,273
)
 
(0.67
)
 
(0.67
)
2nd Quarter
326,754

 
5,582

 
(9,515
)
 
(9,515
)
 
(0.11
)
 
(0.11
)
1st Quarter
318,854

 
(3,052
)
 
(16,163
)
 
(16,163
)
 
(0.19
)
 
(0.19
)

(1) 
The fourth quarter of 2017 was favorably impacted by a $7,310 gain on the extinguishment of a portion of our contractual commitments associated with the construction of the Helguvik project.
(2) 
The first quarter of 2017 was unfavorably impacted by net losses on forward and derivative contracts of $16,137.
(3) 
The fourth quarter of 2016 was unfavorably impacted by a $152,200 impairment charge for Helguvik.
(4) 
The third quarter of 2016 was unfavorably impacted by a $23,000 charge related to the Ravenswood retiree medical proposed settlement.