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Related Party Transactions (Tables)
 9 Months Ended
Sep. 30, 2024
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions
Related-party notes payable was as follows:
Weighted Average Interest Rate as of September 30, 2024
September 30, 2024December 31, 2023
(In thousands)
Borrowing arrangements with MDU Resources
6.10 %$214,525 $168,531 
Total related-party notes payable
$214,525 $168,531 
Operating lease information for related-party leases was as follows:
September 30, 2024December 31, 2023
(In thousands)
Operating lease right-of-use assets
$68 $136 
Current portion of operating lease liabilities
68 90 
Operating lease liabilities
$— $46