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Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2022

Retirement Benefits [Abstract]

Schedule of pension plan and other benefits plan

		(Thousands of Dollars)
		Pension Plan								Other Benefits Plan
		December 31,
		2022				2021				2022				2021
Change in Projected Benefit Obligation:
Beginning Balance		$	113,710			$	115,861			$	49,396			$	52,776
Service Cost			2,362				2,696				799				917
Interest Cost			3,042				2,706				1,325				1,236
Actuarial (Gain) Loss			(27,850	)			(4,185	)			(17,761	)			(4,705	)
Benefits Paid			(3,476	)			(3,368	)			(850	)			(828	)
Ending Balance		$	87,788			$	113,710			$	32,909			$	49,396

Schedule of change in fair value of plan assets

		(Thousands of Dollars)
		Pension Plan								Other Benefits Plan
		December 31,
		2022				2021				2022				2021
Change in Fair Value of Plan Assets:
Beginning Balance		$	100,750			$	88,921			$	50,668			$	44,892
Actual Return on Plan Assets			(14,346	)			11,798				(6,639	)			5,776
Employer Contributions			1,900				3,400				850				828
Benefits Paid			(3,476	)			(3,369	)			(850	)			(828	)
Ending Balance		$	84,828			$	100,750			$	44,029			$	50,668
Funded Status		$	(2,960	)		$	(12,960	)		$	11,120			$	1,272

Schedule of employee benefit plans recognized in balance sheet

		(Thousands of Dollars)
		Pension Plan								Other Benefits Plan
		December 31,
		2022				2021				2022				2021
Amounts Recognized in the Consolidated
Balance Sheets consist of:
Current Liability		$	529			$	398			$	—			$	—
Noncurrent Liability (Asset)			2,431				12,562				(11,120	)			(1,272	)
Net Liability (Asset) Recognized		$	2,960			$	12,960			$	(11,120	)		$	(1,272	)

Schedule of components of net benefit cost

		(Thousands of Dollars)
		Pension Plan												Other Benefits Plan
		Years Ended December 31,
		2022				2021				2020				2022				2021				2020
Components of Net Periodic Benefit Cost
Service Cost		$	2,363			$	2,696			$	2,434			$	799			$	917			$	993
Interest Cost			3,042				2,706				3,099				1,325				1,236				1,699
Expected Return on Plan Assets			(7,041	)			(6,225	)			(5,635	)			(3,547	)			(3,142	)			(2,853	)
Amortization of Net Actuarial Loss			1,673				2,868				2,059				—				527				1,352
Net Periodic Benefit Cost*		$	37			$	2,045			$	1,957			$	(1,423	)		$	(462	)		$	1,191

*Service cost is included in Operations and Maintenance expense on the consolidated statements of income; all other amounts are included in Other Income (Expense), net.

Schedule of regulatory assets into net periodic benefit cost

		(Thousands of Dollars)
		Pension Plan				Other  Benefits Plan
Actuarial Loss (Gain)		$	658			$	(191	)

Schedule of discount and compensation rates

		Pension Plan												Other Benefits Plan
		2022				2021				2020				2022				2021				2020
Weighted Average Assumptions:
Expected Return on Plan Assets			7.00	%			7.00	%			7.00	%			7.00	%			7.00	%			7.00	%
Discount Rate for:
Benefit Obligation			4.98	%			2.72	%			2.37	%			4.98	%			2.72	%			2.37	%
Benefit Cost			2.72	%			2.37	%			3.12	%			2.72	%			2.37	%			3.12	%
Compensation Increase for:
Benefit Obligation			3.00	%			3.00	%			3.00	%			3.00	%			3.00	%			3.00	%
Benefit Cost			3.00	%			3.00	%			3.00	%			3.00	%			3.00	%			3.00	%

Schedule of effect of one-percentage point change in assumed health care cost trend rates

		(Thousands of Dollars)
		1 Percentage Point
		Increase				Decrease
Effect on Current Year Service and Interest Costs		$	435			$	(334	)
Effect on Projected Benefit Obligation		$	4,239			$	(3,448	)

Schedule of expected benefit payments

		(Thousands of Dollars)
Year		Pension Plan				Other Benefits Plan
2023		$	4,153			$	1,262
2024			4,961				1,423
2025			5,349				1,550
2026			5,344				1,645
2027			5,437				1,699
2028-2032			28,483				9,363
Totals		$	53,727			$	16,942

Schedule of allocation of plan assets

		Pension Plan												Other Benefits Plan
Asset Category		2022				2021				Target				2022				2021				Target
Equity Securities			53.6	%			59.6	%			55	%			55.2	%			66.8	%			43	%
Debt Securities			40.9	%			37.9	%			38	%			24.7	%			30.7	%			50	%
Cash			3.9	%			1.0	%			2	%			20.1	%			2.5	%			2	%
Real Estate/Commodities			1.6	%			1.5	%			5	%			0.0	%			0.0	%			5	%
Total			100.0	%			100.0	%							100.0	%			100.0	%

Schedule of fair value of plan assets

		(Thousands of Dollars)
		As of December 31, 2022
		Level 1				Level 2				Level 3				Total
Mutual Funds		$	71,559			$	—			$	—			$	71,559
Money Market Funds			3,271				—				—				3,271
Common Equity Securities			9,998				—				—				9,998
Total Investments		$	84,828			$	—			$	—			$	84,828

		(Thousands of Dollars)
		As of December 31, 2021
		Level 1				Level 2				Level 3				Total
Mutual Funds		$	87,687			$	—			$	—			$	87,687
Money Market Funds			1,057				—				—				1,057
Common Equity Securities			12,006				—				—				12,006
Total Investments		$	100,750			$	—			$	—			$	100,750

		(Thousands of Dollars)
		As of December 31, 2022
		Level 1				Level 2				Level 3				Total
Mutual Funds		$	23,660			$	—			$	—			$	23,660
Money Market Funds			8,623				—				—				8,623
Agency/US/State/Municipal Debt			—				10,592				—				10,592
Other			1,154				—				—				1,154
Total Investments		$	33,437			$	10,592			$	—			$	44,029

		(Thousands of Dollars)
		As of December 31, 2021
		Level 1				Level 2				Level 3				Total
Mutual Funds		$	33,844			$	—			$	—			$	33,844
Money Market Funds			1,291				—				—				1,291
Agency/US/State/Municipal Debt			—				15,533				—				15,533
Total Investments		$	35,135			$	15,533			$	—			$	50,668

Schedule of table presents awarded but not yet vested share

		Shares(thousands)				Unearned Compensation (thousands)				Weighted Average Granted Price
Balance, January 1, 2020			97				1,706
Granted			16				982			$	60.12
Vested			(27	)			—
Amortization of Compensation expense			—				(851	)
Balance, December 31, 2020			86				1,837
Granted			15				1,151			$	79.02
Vested			(18	)
Amortization of Compensation expense			—				(1,057	)
Balance, December 31, 2021			83				1,931
Granted			11				1,151			$	105.17
Vested			(17	)			—
Amortization of Compensation expense			—				(1,350	)
Balance, December 31, 2022			77			$	1,732

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Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans.

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