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Inventories
 9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Inventories
Inventories
 
Inventories consist of the following: 
 
 
September 30,
 
December 31,
 
 
2018
 
2017
 
 
(In thousands)
Coal
 
$
77,497

 
$
54,692

Repair parts and supplies
 
86,381

 
74,268

 
 
$
163,878

 
$
128,960


 
The repair parts and supplies are stated net of an allowance for slow-moving and obsolete inventories of $1.0 million at September 30, 2018 and $0.3 million at December 31, 2017.