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Segment Reporting (Tables)
 3 Months Ended
Mar. 31, 2016
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 months ended March 31, 2016 and 2015:
 
Three Months Ended 
 March 31,
 
2016
 
2015
Sales:
 
 
 
Oil & Gas Proppants
$
73,865

 
$
148,753

Industrial & Specialty Products
48,645

 
55,205

Total Sales
122,510

 
203,958

Segment contribution margin:
 
 
 
Oil & Gas Proppants
851

 
52,195

Industrial & Specialty Products
16,893

 
15,456

Total segment contribution margin
17,744

 
67,651

Operating activities excluded from segment cost of goods sold
(1,985
)
 
(2,346
)
Selling, general and administrative
(15,503
)
 
(26,961
)
Depreciation, depletion and amortization
(14,556
)
 
(13,243
)
Interest expense
(6,643
)
 
(6,836
)
Other income, net, including interest income
1,790

 
11

Income (loss) before income taxes
$
(19,153
)
 
$
18,276