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Accumulated other comprehensive loss (Tables)
 12 Months Ended
Dec. 31, 2022
Equity [Abstract]  
Accumulated comprehensive 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, 2020$(984)$(47,207)$113 $(48,078)
Other comprehensive income (loss) before reclassifications— 4,876 (252)4,624 
Amounts reclassified from accumulated other comprehensive loss446 1,870 134 2,450 
Net current-period other comprehensive income (loss)446 6,746 (118)7,074 
At December 31, 2021(538)(40,461)(5)(41,004)
Other comprehensive income (loss) before reclassifications— 12,007 (667)11,340 
Amounts reclassified to accumulated other comprehensive loss from a regulatory asset— (3,265)— (3,265)
Amounts reclassified from accumulated other comprehensive loss413 1,819 114 2,346 
Net current-period other comprehensive income (loss)413 10,561 (553)10,421 
At December 31, 2022$(125)$(29,900)$(558)$(30,583)
Reclassification out of accumulated other comprehensive loss
The following amounts were reclassified out of accumulated other comprehensive loss into net income. The amounts presented in parentheses indicate a decrease to net income on the Consolidated Statements of Income. The reclassifications for the years ended December 31 were as follows:
 20222021Location on Consolidated
Statements of Income
(In thousands)
Reclassification adjustment for loss on derivative instruments included in net income$(590)$(591)Interest expense
177 145 Income taxes
(413)(446)
Amortization of postretirement liability losses included in net periodic benefit credit(2,416)(2,485)Other income
597 615 Income taxes
(1,819)(1,870)
Reclassification adjustment on available-for-sale investments included in net income(145)(170)
Other income
31 36 
Income taxes
(114)(134)
Total reclassifications$(2,346)$(2,450)