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LEASES: Level 3 (Tables)
 12 Months Ended
Dec. 31, 2025
Leases [Abstract]  
Lease, Cost [Table Text Block]
The following table provides a summary of the components of total lease cost included in the consolidated statements of income for the year ended December 31 (in thousands of dollars):
2025
Finance lease cost:
Amortization of ROU asset (Depreciation and amortization)$3,762 
Interest on lease liabilities (Interest on long-term debt and finance leases)(1)
8,586 
Total finance lease cost12,348 
Variable lease cost (Other O&M)973 
Total lease cost$13,321 
(1) Included in operating activities in the consolidated statements of cash flows as cash paid for amounts included in the measurement of lease liabilities.
Lessee, Finance Lease, Disclosure
The following table presents the classification of certain lease amounts included in the consolidated balance sheets as of December 31 (in thousands of dollars):
2025
Finance leases:
Other current liabilities$6,161 

The following table presents the weighted-average remaining lease term and weighted-average discount rate as of December 31:
2025
Finance leases:
Weighted average remaining lease term19.38 years
Weighted average discount rate6.17 %
Finance Lease, Liability, to be Paid, Rolling Maturity [Abstract]
The following table presents the maturities of future fixed lease payments and a reconciliation of undiscounted cash flows to lease liabilities recognized on the consolidated balance sheets as of December 31, 2025 (in thousands of dollars):
Finance Leases
2026$19,751 
202719,751 
202819,751 
202919,751 
203019,751 
Thereafter283,907 
Total future fixed lease payments382,662 
Less: amounts representing interest(159,806)
Total present value of lease liabilities222,856