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Inventories
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Inventories
Inventories
 
Inventories consist of the following: 
 
 
December 31, 2018
 
December 31, 2017
(In thousands)
 
 
 
 
Coal
 
$
40,982

 
$
54,692

Repair parts and supplies
 
84,488

 
74,268

 
 
$
125,470

 
$
128,960


 
The repair parts and supplies are stated net of an allowance for slow-moving and obsolete inventories of $0.6 million at December 31, 2018 and $0.3 million at December 31, 2017.