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Inventories (Tables)
 12 Months Ended
Dec. 31, 2013
Inventory Disclosure [Abstract]  
Inventories
Inventories consist of the following: 
 
 
December 31
 
 
2013
 
2012
 
 
(In thousands)
Coal
 
$
117,531

 
$
180,917

Repair parts and supplies
 
137,497

 
172,139

Work-in-process
 
9,133

 
12,368

 
 
$
264,161

 
$
365,424