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Unconsolidated Subsidiaries (Tables)
9 Months Ended
Sep. 30, 2014
Equity Method Investments and Joint Ventures [Abstract]  
Schedule of Variable Interest Entities
Summarized financial information for the Unconsolidated Mines, NoDak and NACC India is as follows:
 
THREE MONTHS ENDED
 
NINE MONTHS ENDED
 
SEPTEMBER 30
 
SEPTEMBER 30
 
2014
 
2013
 
2014
 
2013
Revenues
$
150,529

 
$
152,999

 
$
437,127

 
$
433,937

Gross profit
$
19,504

 
$
18,847

 
$
56,123

 
$
55,859

Income before income taxes
$
12,201

 
$
12,172

 
$
36,363

 
$
35,650

Net income
$
9,372

 
$
9,471

 
$
28,046

 
$
27,463