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Equity Method Investment (Tables)
9 Months Ended
Sep. 30, 2023
Equity Method Investments and Joint Ventures [Abstract]  
Marketable Securities Summarized financial information for NMRD is as follows:
Results of Operations
Three Months Ended September 30,Nine Months Ended September 30,
2023202220232022
(In thousands)
Operating revenues
$4,020 $3,407 $10,525 $10,224 
Operating expenses1,743 2,381 6,127 7,172 
Net earnings
$2,277 $1,026 $4,398 $3,052 

Financial Position
September 30,December 31,
20232022
(In thousands)
Current assets$9,529 $8,357 
Net property, plant, and equipment229,659 169,440 
Non-current assets2,480 9,631 
Total assets
241,668 187,428 
Current liabilities4,176 5,822 
Non-current liabilities355 366 
Owners’ equity
$237,137 $181,240