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CONCENTRATION OF CREDIT RISK AND MAJOR CUSTOMERS (Tables)
12 Months Ended
Dec. 31, 2022
CONCENTRATION OF CREDIT RISK AND MAJOR CUSTOMERS  
Schedule of total revenues from major customers

Year Ended December 31, 

 

    

Segment

    

2022

2021

2020

 

(in thousands)

Customer A

 

Illinois Basin

$

328,406

$

239,482

$

197,379

Customer B

Illinois Basin

260,146

157,271

Customer C

Illinois Basin/Appalachia

228,480

Customer D

 

Illinois Basin/Appalachia

 

 

137,785