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Inventories
3 Months Ended
Mar. 31, 2015
Inventory Disclosure [Abstract]  
Inventories
Inventories
Inventories are summarized as follows (in thousands):
 
March 31, 2015
 
December 31, 2014
Coal
$
109,579

 
$
136,335

Raw materials, supplies and other
62,756

 
65,263

Total inventories
$
172,335

 
$
201,598