v3.26.1
Inventories (Tables)
6 Months Ended
Jun. 30, 2026
Inventory Disclosure [Abstract]  
Schedule of inventories

  ​ ​ ​

June 30, 

December 31, 

2026

  ​ ​ ​

2025

 

(in thousands)

Coal

$

37,271

$

61,528

Finished goods (net of reserve for obsolescence of $1,733 and $1,133, respectively)

7,952

9,732

Work in process

169

2,660

Raw materials

8,716

6,106

54,108

80,026

Supplies (net of reserve for obsolescence of $9,998 and $6,901, respectively)

 

71,023

 

62,593

Total inventories, net

$

125,131

$

142,619