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Inventories (Tables)
6 Months Ended
Jun. 30, 2020
Inventories  
Inventories

    

June 30, 

    

December 31, 

 

2020

 

2019

(In thousands)

Coal

$

67,702

$

46,815

Repair parts and supplies

 

86,988

 

84,083

$

154,690

$

130,898