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Unaudited Supplementary Data
 12 Months Ended
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]  
Unaudited Supplementary Data
llowing table sets forth our unaudited quarterly consolidated statements of operations (in thousands, except per share data) for each of the four quarters in the years ended December 31, 2015 and 2014. This unaudited quarterly information has been prepared on the same basis as our annual audited financial statements and includes all adjustments, consisting only of normal recurring adjustments that are necessary to present fairly the financial information for the fiscal quarters presented.
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
2015:
(Unaudited)
Sales
$
203,958

 
$
147,511

 
$
155,408

 
$
136,112

Cost of goods sold (excluding depreciation, depletion and amortization)
138,653

 
117,200

 
122,599

 
116,614

Operating expenses
 
 
 
 
 
 
 
Selling, general and administrative
26,961

 
6,575

 
13,559

 
15,682

Depreciation, depletion and amortization
13,243

 
13,695

 
15,158

 
16,378

 
$
40,204

 
$
20,270

 
$
28,717

 
$
32,060

Operating income (loss)
25,101

 
10,041

 
4,092

 
(12,562
)
Other income (expense)
 
 
 
 
 
 
 
Interest expense
(6,836
)
 
(6,928
)
 
(6,684
)
 
(6,835
)
Other income (expense), net, including interest income
11

 
498

 
309

 
(90
)
 
$
(6,825
)
 
$
(6,430
)
 
$
(6,375
)
 
$
(6,925
)
Income (loss) before income taxes
18,276

 
3,611

 
(2,283
)
 
(19,487
)
Income tax benefit (expense)
(3,453
)
 
6,342

 
4,695

 
4,167

Net income (loss)
$
14,823

 
$
9,953

 
$
2,412

 
$
(15,320
)
Earnings (loss) per share, basic
$
0.28

 
$
0.19

 
$
0.05

 
$
(0.29
)
Earnings (loss) per share, diluted
$
0.27

 
$
0.18

 
$
0.04

 
$
(0.29
)
Weighted average shares outstanding, basic
53,416

 
53,303

 
53,321

 
53,323

Weighted average shares outstanding, diluted
53,869

 
53,857

 
53,742

 
53,520

Dividends declared per share
$
0.13

 
$
0.13

 
$
0.13

 
$
0.06

 
 
 
 
 
 
 
 
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
2014:
(Unaudited)
Sales
$
180,095

 
$
205,801

 
$
241,256

 
$
249,589

Cost of goods sold (excluding depreciation, depletion and amortization)
126,770

 
132,417

 
149,697

 
157,700

Operating expenses
 
 
 
 
 
 
 
Selling, general and administrative
15,445

 
19,267

 
18,600

 
35,659

Depreciation, depletion and amortization
9,589

 
10,341

 
12,425

 
12,664

 
$
25,034

 
$
29,608

 
$
31,025

 
$
48,323

Operating income
28,291

 
43,776

 
60,534

 
43,566

Other income (expense)
 
 
 
 
 
 
 
Interest expense
(3,808
)
 
(4,013
)
 
(4,950
)
 
(5,431
)
Other income, net, including interest income
38

 
221

 
120

 
379

 
$
(3,770
)
 
$
(3,792
)
 
$
(4,830
)
 
$
(5,052
)
Income before income taxes
24,521

 
39,984

 
55,704

 
38,514

Income tax expense
(6,150
)
 
(11,330
)
 
(14,427
)
 
(5,276
)
Net income
$
18,371

 
$
28,654

 
$
41,277

 
$
33,238

Earnings per share, basic
$
0.34

 
$
0.53

 
$
0.77

 
$
0.62

Earnings per share, diluted
$
0.34

 
$
0.53

 
$
0.76

 
$
0.61

Weighted average shares outstanding, basic
53,505

 
53,733

 
53,801

 
53,838

Weighted average shares outstanding, diluted
54,054

 
54,262

 
54,393

 
54,340

Dividends declared per share
$
0.13

 
$
0.13

 
$
0.13

 
$
0.13