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Equity Method Investment (Tables)
6 Months Ended
Jun. 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 June 30,Six Months Ended June 30,
2023202220232022
(In thousands)
Operating revenues
$3,975 $4,021 $6,505 $6,817 
Operating expenses1,965 2,387 4,384 4,791 
Net earnings
$2,010 $1,634 $2,121 $2,026 

Financial Position
June 30,December 31,
20232022
(In thousands)
Current assets$4,468 $8,357 
Net property, plant, and equipment200,071 169,440 
Non-current assets9,856 9,631 
Total assets
214,395 187,428 
Current liabilities1,162 5,822 
Non-current liabilities373 366 
Owners’ equity
$212,860 $181,240