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Inventories (Tables)
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Inventories
Inventories consist of the following: 
 
 
March 31,
 
December 31,
 
 
2019
 
2018
 
 
(In thousands)
Coal
 
$
57,147

 
$
40,982

Repair parts and supplies
 
88,460

 
84,488

 
 
$
145,607

 
$
125,470