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Equity Method Investment (Tables)
 6 Months Ended
Jun. 30, 2024
Equity Method Investments and Joint Ventures [Abstract]  
Marketable Securities Summarized financial information for NMRD through the closing date of the sale is as follows:
Results of Operations
Three Months Ended June 30,Six Months Ended June 30,
2024202320242023
(In thousands)
Operating revenues
$— $3,975 $3,204 $6,505 
Operating expenses— 1,965 3,378 4,384 
Net earnings (loss)
$— $2,010 $(174)$2,121 
Financial Position
June 30,December 31,
20242023
(In thousands)
Current assets$— $2,589 
Net property, plant, and equipment— 235,791 
Non-current assets— 1,849 
Total assets
— 240,229 
Current liabilities— 730 
Non-current liabilities— 358 
Owners’ equity
$— $239,141