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Unconsolidated Subsidiaries (Tables)
9 Months Ended
Sep. 30, 2013
Equity Method Investments and Joint Ventures [Abstract]  
Schedule of Variable Interest Entities
Summarized financial information for the ten Unconsolidated Mines is as follows:
 
THREE MONTHS ENDED
 
NINE MONTHS ENDED
 
SEPTEMBER 30
 
SEPTEMBER 30
 
2013
 
2012
 
2013
 
2012
Revenues
$
152,999

 
$
144,237

 
$
433,937

 
$
413,619

Gross profit
$
18,847

 
$
18,973

 
$
55,859

 
$
56,372

Income before income taxes
$
12,172

 
$
11,920

 
$
35,650

 
$
35,517

Net income
$
9,471

 
$
9,895

 
$
27,463

 
$
28,292