Pension and Other Postretirement Benefits Costs - Schedule of Amounts Realized in Other Comprehensive Loss (Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Regulatory Asset, Net actuarial loss (gain)	$ 2,833	$ (32,258)	$ 16,170
Regulatory Asset, Prior service cost	0	0	0
Regulatory Asset, Actuarial loss	(11,531)	(21,250)	(18,627)
Regulatory Asset, Total	(8,698)	(53,508)	(2,457)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Regulatory Asset, Net actuarial loss (gain)	(6,234)	(688)	145
Regulatory Asset, Prior service cost	333	468	468
Regulatory Asset, Actuarial loss	(426)	(645)	(607)
Regulatory Asset, Total	(6,327)	(865)	6
Qualified Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Amounts reclassified to AOCL	(5,706)	(812)	3,873
Other Comprehensive Loss (Income), Prior service cost	0	0	0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	(1,081)	(1,225)	(923)
Total reclassifications before tax	$ (6,787)	$ (2,037)	$ 2,950