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Inventories
 6 Months Ended
Jun. 30, 2016
Inventory Disclosure [Abstract]  
Inventories
Inventories
 
Inventories consist of the following: 
 
 
June 30,
 
December 31,
 
 
2016
 
2015
 
 
(In thousands)
Coal
 
$
61,874

 
$
85,043

Repair parts and supplies
 
110,824

 
111,677

 
 
$
172,698

 
$
196,720


 
The repair parts and supplies are stated net of an allowance for slow-moving and obsolete inventories of $6.5 million at June 30, 2016 and $6.0 million at December 31, 2015.