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Inventories
 9 Months Ended
Sep. 30, 2015
Inventory Disclosure [Abstract]  
Inventories
Inventories
 
Inventories consist of the following: 
 
 
September 30,
 
December 31,
 
 
2015
 
2014
 
 
(In thousands)
Coal
 
$
119,785

 
$
71,901

Repair parts and supplies
 
119,250

 
118,352

 
 
$
239,035

 
$
190,253


 
The repair parts and supplies are stated net of an allowance for slow-moving and obsolete inventories of $6.7 million at September 30, 2015 and $6.6 million at December 31, 2014.