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Unconsolidated Subsidiaries (Tables)
3 Months Ended
Mar. 31, 2015
Equity Method Investments and Joint Ventures [Abstract]  
Schedule of Variable Interest Entities
Summarized financial information for the Unconsolidated Mines is as follows:
 
THREE MONTHS ENDED
 
MARCH 31
 
2015
 
2014
Revenues
$
148,071

 
$
138,523

Gross profit
$
18,878

 
$
19,493

Income before income taxes
$
13,119

 
$
13,168

Net income
$
10,155

 
$
10,146