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Inventories (Tables)
6 Months Ended
Jun. 30, 2015
Inventory Disclosure [Abstract]  
Inventories
Inventories consist of the following: 
 
 
June 30,
 
December 31,
 
 
2015
 
2014
 
 
(In thousands)
Coal
 
$
99,691

 
$
71,901

Repair parts and supplies
 
124,238

 
118,352

 
 
$
223,929

 
$
190,253