Benefit Plans - Change in Accumulated Other Comprehensive Income (AOCI) and Expected Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Pension and Supplemental Executive Retirement Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI in Prior Year	$ 92,956	$ 83,298
Recognized during year - Prior Service (Cost) Credit	(345)	745
Recognized during year - Net Actuarial (Losses) Gains	(11,933)	(20,109)
Occurring during year - Prior Service Cost	0	3,247
Occurring during year - Net Actuarial Losses (Gains)	1,531	25,775
AOCI in Current Year	82,209	92,956
Other Postretirement Benefit Plan
AOCI Attributable to Parent, Net of Tax [Roll Forward]
AOCI in Prior Year	(532)	(44,891)
Recognized during year - Prior Service (Cost) Credit	(1,861)	(489)
Recognized during year - Net Actuarial (Losses) Gains	150	3,103
Occurring during year - Prior Service Cost	(346)	11,277
Occurring during year - Net Actuarial Losses (Gains)	(17,174)	30,468
AOCI in Current Year	$ (19,763)	$ (532)

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, before tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

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Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

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