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Inventories (Tables)
12 Months Ended
Dec. 31, 2020
Inventories  
Inventories

    

December 31, 

    

December 31, 

 

2020

 

2019

(In thousands)

Coal

$

49,436

$

46,815

Repair parts and supplies

 

76,572

 

84,083

$

126,008

$

130,898