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Inventories (Tables)
 9 Months Ended
Sep. 30, 2014
Inventory Disclosure [Abstract]  
Inventories
Inventories consist of the following: 
 
 
September 30,
 
December 31,
 
 
2014
 
2013
 
 
(In thousands)
Coal
 
$
83,708

 
$
117,531

Repair parts and supplies
 
125,951

 
137,497

Work-in-process
 
—

 
9,133

 
 
$
209,659

 
$
264,161