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Inventories (Tables)
9 Months Ended
Sep. 30, 2013
Inventory Disclosure [Abstract]  
Inventory components
 
September 30,
2013
 
December 31,
2012
Coal
$
58,050

 
$
78,825

Merchandise for resale
37,792

 
35,363

Supplies
142,506

 
133,578

Total Inventories
$
238,348

 
$
247,766