Employee Benefit Plans - Schedule of Defined Benefit Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Amounts recognized on the balance sheets:
Non-current liabilities	$ (32,652)	$ (33,636)
SERP
Amounts recognized on the balance sheets:
Current liabilities	(942)	(942)
Non-current liabilities	(32,652)	(29,865)
Net amount recognized	(33,594)	(30,807)
Amounts recognized in regulatory assets (liabilities) consist of:
Prior service cost (credit)	0	0
Net loss	2,869	1,995
Regulatory assets (liabilities)	2,869	1,995	$ 9,097
Unfunded accrued cost	30,725	28,812
Net liability (asset) recognized	33,594	30,807
Changes in plan assets and benefit obligations recognized in regulatory assets (liabilities):
Regulatory asset (liability) at beginning of year	1,995	9,097
Net gain (loss)	840	(6,522)
Amortization of prior service credit	0	0
Amortization of net loss	34	(580)
Total change in regulatory asset (liability)	874	(7,102)
Regulatory asset (liability) at end of year	2,869	1,995	9,097
Net periodic pension costs	2,858	2,793	3,985
Change in regulatory asset (liability)	874	(7,102)
Total recognized in net periodic pension cost and regulatory asset (liability)	3,732	(4,309)
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets:
Projected benefit obligation	33,594	30,807	$ 36,089
Accumulated benefit obligation	30,794	28,157
Fair value of plan assets	$ 0	$ 0
Weighted-average assumptions used to determine benefit obligations at December 31:
Discount rate	5.15%	5.42%
SERP | Maximum
Weighted-average assumptions used to determine benefit obligations at December 31:
Rate of compensation increase	4.00%	4.00%
SERP | Minimum
Weighted-average assumptions used to determine benefit obligations at December 31:
Rate of compensation increase	5.50%	5.50%