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Inventories (Tables)
6 Months Ended
Jun. 30, 2014
Inventory Disclosure [Abstract]  
Inventory components
 
June 30,
2014
 
December 31,
2013
Coal
$
23,953

 
$
31,944

Merchandise for resale
39,251

 
38,263

Supplies
84,801

 
87,707

Total Inventories
$
148,005

 
$
157,914