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Inventories
 12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Inventories Inventories
 
Inventories consist of the following: 
 
 
December 31, 2019
 
December 31, 2018
(In thousands)
 
 
 
 
Coal
 
$
46,815

 
$
40,982

Repair parts and supplies
 
84,083

 
84,488

 
 
$
130,898

 
$
125,470


 
The repair parts and supplies are stated net of an allowance for slow-moving and obsolete inventories of $2.2 million at December 31, 2019 and $0.6 million at December 31, 2018.