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Unconsolidated Subsidiaries (Tables)
3 Months Ended
Mar. 31, 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
 
MARCH 31
 
2014
 
2013
Revenues
$
138,523

 
$
139,636

Gross profit
$
19,493

 
$
19,497

Income before income taxes
$
13,168

 
$
12,783

Net income
$
10,146

 
$
9,801