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Accumulated Other Comprehensive Loss
 12 Months Ended
Dec. 31, 2023
Equity [Abstract]  
Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss
The Company's accumulated other comprehensive loss is comprised of losses on derivative instruments qualifying as hedges, postretirement liability adjustments and gain (loss) on available-for-sale investments.
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, 2021$(538)$(40,461)$(5)$(41,004)
Other comprehensive income (loss) before reclassifications— 12,007 (667)11,340 
Amounts reclassified to accumulated other comprehensive loss from a regulatory asset— (3,265)— (3,265)
Amounts reclassified from accumulated other comprehensive loss413 1,819 114 2,346 
Net current-period other comprehensive income (loss)413 10,561 (553)10,421 
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)$(18,384)
The following amounts were reclassified out of accumulated other comprehensive loss into net income. The amounts presented in parentheses indicate a decrease to net income on the Consolidated Statements of Income. The reclassifications for the years ended December 31 were as follows:
 20232022Location on Consolidated
Statements of Income
(In thousands)
Reclassification adjustment for loss on derivative instruments included in net income$(96)$(590)Interest expense
15 177 Income taxes
(81)(413)
Amortization of postretirement liability losses included in net periodic benefit credit(320)(2,416)Other income
78 597 Income taxes
(242)(1,819)
Reclassification adjustment on available-for-sale investments included in net income(54)(145)Other income
11 31 Income taxes
(43)(114)
Total reclassifications$(366)$(2,346)