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Equity Method Investment (Tables)
 9 Months Ended
Sep. 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 September 30,Nine Months Ended September 30,
2024202320242023
(In thousands)
Operating revenues
$— $4,020 $3,204 $10,525 
Operating expenses— 1,743 3,378 6,127 
Net earnings (loss)
$— $2,277 $(174)$4,398 

Financial Position
September 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