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Financial Results by Quarter Financial Results by Quarter (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Financial Results by Quarter
Financial Results by Quarter (Unaudited)
 
 
Three Months Ended
(In thousands—
  except per-share
  amounts)
 
March 31,
 
June 30,
 
September 30,
 
December 31,
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Net sales
 
$
437,525

 
$
437,204

 
$
429,663

 
$
436,671

 
$
426,504

 
$
435,320

 
$
436,716

 
$
425,568

Costs and
  expenses:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cost of sales
 
(387,030
)
 
(368,647
)
 
(380,733
)
 
(361,851
)
 
(386,581
)
 
(396,605
)
 
(375,277
)
 
(368,524
)
Selling, general and
  administrative
  expenses
 
(29,937
)
 
(30,795
)
 
(29,265
)
 
(34,655
)
 
(34,472
)
 
(29,435
)
 
(34,785
)
 
(32,934
)
Total operating
  costs and
  expenses
 
(416,967
)
 
(399,442
)
 
(409,998
)
 
(396,506
)
 
(421,053
)
 
(426,040
)
 
(410,062
)
 
(401,458
)
Income from
  operations
 
20,558

 
37,762

 
19,665

 
40,165

 
5,451

 
9,280

 
26,654

 
24,110

Net earnings
 
$
7,515

 
$
18,446

 
$
8,037

 
$
20,864

 
$
863

 
$
901

 
$
80,924

 
$
9,343

Net earnings
  per common share
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Basic
 
$
0.46

 
$
1.05

 
$
0.49

 
$
1.22

 
$
0.05

 
$
0.05

 
$
4.92

 
$
0.56

Diluted
 
0.45

 
1.05

 
0.48

 
1.21

 
0.05

 
0.05

 
4.88

 
0.56