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Equity Method Investment (Tables)
3 Months Ended
Mar. 31, 2023
Equity Method Investments and Joint Ventures [Abstract]  
Marketable Securities Summarized financial information for NMRD is as follows:
Results of Operations
Three Months Ended March 31,
20232022
(In thousands)
Operating revenues
$2,530 $2,796 
Operating expenses2,419 2,404 
Net earnings
$111 $392 

Financial Position
March 31,December 31,
20232022
(In thousands)
Current assets$15,631 $8,357 
Net property, plant, and equipment180,353 169,440 
Non-current assets9,784 9,631 
Total assets
205,768 187,428 
Current liabilities1,048 5,822 
Non-current liabilities369 366 
Owners’ equity
$204,351 $181,240