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Unconsolidated Subsidiaries (Tables)
6 Months Ended
Jun. 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
 
SIX MONTHS ENDED
 
JUNE 30
 
JUNE 30
 
2014
 
2013
 
2014
 
2013
Revenues
$
148,075

 
$
141,302

 
$
286,598

 
$
280,938

Gross profit
$
17,126

 
$
17,515

 
$
36,619

 
$
37,012

Income before income taxes
$
10,994

 
$
10,695

 
$
24,162

 
$
23,478

Net income
$
8,530

 
$
8,191

 
$
18,674

 
$
17,992