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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2024
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The after-tax changes in the components of accumulated other comprehensive loss were as follows:
 Net
Unrealized
Loss on
Derivative
 Instruments
 Qualifying
as Hedges		Post-
retirement
 Liability
Adjustment		Net
Unrealized
Gain (Loss) on
Available-
for-sale
Investments		Total
Accumulated
 Other
Comprehensive
 Loss
 (In thousands)
At December 31, 2022$(125)$(29,900)$(558)$(30,583)
Other comprehensive income (loss) before reclassifications— (646)173 (473)
Amounts reclassified from accumulated other comprehensive loss81 242 43 366 
Net current-period other comprehensive income (loss)81 (404)216 (107)
Amounts reclassified related to the separation of Knife River44 12,262 — 12,306 
At December 31, 2023— (18,042)(342)(18,384)
Other comprehensive income before reclassifications
— 1,049 85 1,134 
Amounts reclassified from accumulated other comprehensive loss— 432 20 452 
Net current-period other comprehensive income
— 1,481 105 1,586 
At December 31, 2024$— $(16,561)$(237)$(16,798)
Schedule of Reclassification Out of AOCI
The following amounts were reclassified out of accumulated other comprehensive loss into net income. The amounts presented in parentheses indicate a decrease to net income on the Consolidated Statements of Income. The reclassifications for the years ended December 31 were as follows:
 20242023Location on Consolidated
Statements of Income
(In thousands)
Reclassification adjustment for loss on derivative instruments included in net income$— $(96)Interest expense
— 15 Income taxes
— (81)
Amortization of postretirement liability losses included in net periodic benefit credit(577)(320)Other income
145 78 Income taxes
(432)(242)
Reclassification adjustment on available-for-sale investments included in net income(25)(54)Other income
5 11 Income taxes
(20)(43)
Total reclassifications$(452)$(366)