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Segment Reporting (Tables)
 6 Months Ended
Jun. 30, 2017
Segment Reporting [Abstract]  
Presentation of Sales and Segment Contribution Margin for Reporting Segments and Other Operating Results
The following table presents sales and segment contribution margin (in thousands) for the reporting segments and other operating results not allocated to the reported segments for the three and six months ended June 30, 2017 and 2016:
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2017
 
2016
 
2017
 
2016
Sales:
 
 
 
 
 
 
 
Oil & Gas Proppants
$
235,018

 
$
64,926

 
$
427,976

 
$
138,791

Industrial & Specialty Products
55,447

 
52,068

 
107,286

 
100,713

Total sales
290,465

 
116,994

 
535,262

 
239,504

Segment contribution margin:
 
 
 
 
 
 
 
Oil & Gas Proppants
71,222

 
(5,995
)
 
110,062

 
(5,144
)
Industrial & Specialty Products
23,267

 
21,486

 
43,484

 
38,380

Total segment contribution margin
94,489

 
15,491

 
153,546

 
33,236

Operating activities excluded from segment cost of sales
(1,435
)
 
(1,204
)
 
(3,170
)
 
(3,190
)
Selling, general and administrative
(26,012
)
 
(14,585
)
 
(48,353
)
 
(30,088
)
Depreciation, depletion and amortization
(23,626
)
 
(15,209
)
 
(45,225
)
 
(29,765
)
Interest expense
(8,105
)
 
(6,647
)
 
(15,751
)
 
(13,290
)
Other income (expense), net, including interest income
1,258

 
608

 
(3,670
)
 
2,398

Income tax benefit (expense)
(7,110
)
 
9,774

 
(5,396
)
 
17,924

Net income (loss)
$
29,459

 
$
(11,772
)
 
$
31,981

 
$
(22,775
)