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Segment Reporting (Tables)
 12 Months Ended
Dec. 31, 2015
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 years ended December 31, 2015, 2014 and 2013:
 
Years Ended December 31,
 
2015
 
2014
 
2013
Sales:
 
 
 
 
 
Oil & Gas Proppants
$
430,435

 
$
662,770

 
$
347,439

Industrial & Specialty Products
212,554

 
213,971

 
198,546

Total sales
$
642,989

 
$
876,741

 
$
545,985

Segment contribution margin:
 
 
 
 
 
Oil & Gas Proppants
$
88,928

 
$
256,137

 
$
145,916

Industrial & Specialty Products
70,137

 
61,102

 
56,983

Total segment contribution margin
$
159,065

 
$
317,239

 
$
202,899

Operating activities excluded from segment cost of goods sold
(11,142
)
 
(7,082
)
 
(5,481
)
Selling, general and administrative
(62,777
)
 
(88,971
)
 
(49,759
)
Depreciation, depletion and amortization
(58,474
)
 
(45,019
)
 
(36,418
)
Interest expense
(27,283
)
 
(18,202
)
 
(15,341
)
Early extinguishment of debt
—

 
—

 
(480
)
Other income, net, including interest income
728

 
758

 
597

Income before income taxes
$
117

 
$
158,723

 
$
96,017