Accumulated other comprehensive loss (Tables)

9 Months Ended

Sep. 30, 2023

Equity [Abstract]

Accumulated comprehensive loss

Accumulated other comprehensive loss

The after-tax changes in the components of accumulated other comprehensive loss were as follows:

	Net Unrealized Gain (Loss) on Derivative  Instruments  Qualifying as Hedges		Postretirement  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 before reclassifications	—		—		70		70
Amounts reclassified from accumulated other comprehensive loss	34		100		13		147
Net current-period other comprehensive income	34		100		83		217
At March 31, 2023	$	(91)	$	(29,800)	$	(475)	$	(30,366)
Other comprehensive income before reclassifications	—		—		(84)		(84)
Amounts reclassified from accumulated other comprehensive loss	47		387		13		447
Net current-period other comprehensive income (loss)	47		387		(71)		363
Amounts reclassified related to the separation of Knife River	44		12,262		—		12,306
At June 30, 2023	$	—	$	(17,151)	$	(546)	$	(17,697)
Other comprehensive loss before reclassifications	—		—		(66)		(66)
Amounts reclassified from accumulated other comprehensive loss	—		(6)		10		4
Net current-period other comprehensive income (loss)	—		(6)		(56)		(62)
At September 30, 2023	$	—	$	(17,157)	$	(602)	$	(17,759)

	Net Unrealized Gain (Loss) on Derivative  Instruments  Qualifying as Hedges		Postretirement  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 loss before reclassifications	—		—		(320)		(320)
Amounts reclassified from accumulated other comprehensive loss	112		445		32		589
Net current-period other comprehensive income (loss)	112		445		(288)		269
At March 31, 2022	$	(426)	$	(40,016)	$	(293)	$	(40,735)
Other comprehensive loss before reclassifications	—		—		(128)		(128)
Amounts reclassified to accumulated other comprehensive loss from a regulatory asset	—		(3,265)		—		(3,265)
Amounts reclassified from accumulated other comprehensive loss	111		461		25		597
Net current-period other comprehensive income (loss)	111		(2,804)		(103)		(2,796)
At June 30, 2022	$	(315)	$	(42,820)	$	(396)	$	(43,531)
Other comprehensive loss before reclassifications	—		—		(329)		(329)
Amounts reclassified from accumulated other comprehensive loss	111		461		42		614
Net current-period other comprehensive income (loss)	111		461		(287)		285
At September 30, 2022	$	(204)	$	(42,359)	$	(683)	$	(43,246)

The following amounts were reclassified out of accumulated other comprehensive loss into net income. The amounts presented in parenthesis indicate a decrease to net income on the Consolidated Statements of Income. The reclassifications were as follows:

	Three Months Ended				Nine Months Ended				Location on Consolidated Statements of Income
	September 30,				September 30,
	2023		2022		2023		2022
	(In thousands)
Reclassification adjustment for loss on derivative instruments included in net income	$	—	$	(148)	$	(98)	$	(443)	Interest expense
	—		37		17		109		Income taxes
	—		(111)		(81)		(334)
Amortization of postretirement liability losses included in net periodic benefit credit	(92)		(609)		(744)		(1,827)		Other income
	98		148		263		460		Income taxes
	6		(461)		(481)		(1,367)
Reclassification adjustment on available-for-sale investments included in net income	(13)		(54)		(45)		(126)		Other income
	3		12		9		27		Income taxes
	(10)		(42)		(36)		(99)
Total reclassifications	$	(4)	$	(614)	$	(598)	$	(1,800)

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 parenthesis indicate a decrease to net income on the Consolidated Statements of Income. The reclassifications were as follows:

	Three Months Ended				Nine Months Ended				Location on Consolidated Statements of Income
	September 30,				September 30,
	2023		2022		2023		2022
	(In thousands)
Reclassification adjustment for loss on derivative instruments included in net income	$	—	$	(148)	$	(98)	$	(443)	Interest expense
	—		37		17		109		Income taxes
	—		(111)		(81)		(334)
Amortization of postretirement liability losses included in net periodic benefit credit	(92)		(609)		(744)		(1,827)		Other income
	98		148		263		460		Income taxes
	6		(461)		(481)		(1,367)
Reclassification adjustment on available-for-sale investments included in net income	(13)		(54)		(45)		(126)		Other income
	3		12		9		27		Income taxes
	(10)		(42)		(36)		(99)
Total reclassifications	$	(4)	$	(614)	$	(598)	$	(1,800)