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Inventories
6 Months Ended
Jun. 30, 2013
Inventory Disclosure [Abstract]  
Inventories
Inventories
 
Inventories consist of the following: 
 
 
June 30
 
December 31
 
 
2013
 
2012
 
 
(In thousands)
Coal
 
$
177,238

 
$
180,917

Repair parts and supplies
 
163,631

 
172,139

Work-in-process
 
15,784

 
12,368

 
 
$
356,653

 
$
365,424


 
The repair parts and supplies are stated net of an allowance for slow-moving and obsolete inventories of $13.8 million at June 30, 2013 and $13.6 million at December 31, 2012.