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Segment Reporting (Tables)
 6 Months Ended
Jun. 30, 2018
Segment Reporting [Abstract]  
Schedule of Sales and Segment Contribution Margin for Reporting Segments and 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, 2018 and 2017:
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
 
2018
 
2017
 
2018
 
2017
 
Sales:
 
 
 
 
 
 
 
 
Oil & Gas Proppants
$
324,063

 
$
235,018

 
$
636,993

 
$
427,976

 
Industrial & Specialty Products
103,370

 
55,447

 
159,753

 
107,286

 
Total sales
427,433

 
290,465

 
796,746

 
535,262

 
Segment contribution margin:
 
 
 
 
 
 
 
 
Oil & Gas Proppants
114,607

 
71,222

 
214,041

 
110,062

 
Industrial & Specialty Products
41,301

 
23,267

 
61,831

 
43,484

 
Total segment contribution margin
155,908

 
94,489

 
275,872

 
153,546

 
Operating activities excluded from segment cost of sales
(21,320
)
 
(988
)
 
(32,881
)
 
(2,436
)
 
Selling, general and administrative
(42,232
)
 
(25,839
)
 
(76,823
)
 
(47,978
)
 
Depreciation, depletion and amortization
(36,563
)
 
(23,626
)
 
(65,155
)
 
(45,225
)
 
Asset impairment
(16,184
)
 
—

 
(16,184
)
 
—

 
Interest expense
(20,214
)
 
(8,105
)
 
(27,284
)
 
(15,751
)
 
Other income (expense), net, including interest income
1,081

 
638

 
1,746

 
(4,779
)
 
Income tax expense
(2,832
)
 
(7,110
)
 
(10,353
)
 
(5,396
)
 
Net income
$
17,644

 
$
29,459

 
$
48,938

 
$
31,981