Pension Benefits (Details) - USD ($)		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Defined Benefit Plan, service cost		$ 3,706,000	$ 4,652,000	$ 4,455,000
Defined Benefit Plan, interest cost		3,200,000	2,314,000	2,089,000
Defined Benefit Plan, actuarial (gain) loss		84,000	(15,567,000)
Defined Benefit Plan, benefits paid		(4,883,000)	(1,998,000)
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, fair value of plan assets at beginning of year		36,414,000	35,941,000
Defined Benefit Plan, actual return on plan assets		4,161,000	(3,529,000)
Defined Benefit Plan, employer contribution		10,000,000	6,000,000	6,600,000
Defined Benefit Plan, Plan Assets, Benefits Paid		(4,883,000)	(1,998,000)	(6,300,000)
Defined Benefit Plan, fair value of plan assets at end of year		45,692,000	36,414,000	35,941,000
Defined Benefit Plan, funded status at end of year		(21,576,000)	(28,747,000)
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract]
Defined Benefit Plan, projected benefit obligation		67,268,000	65,161,000	75,760,000
Defined Benefit Plan, accumulated benefit obligation		55,557,000	55,712,000
Defined Benefit Plan, underfunded accumulated benefit obligation		$ 9,865,000	19,298,000
Defined Benefit Plan, unrecognized net gain (loss) amortization threshold		10.00%
Pre-tax Amounts Recognized in Accumulated Other Comprehensive Income [Abstract]
Defined Benefit Plan, unrecognized actuarial losses		$ 3,300,000	5,100,000
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Other Comprehensive Income (Loss), Defined Benefit Plan, net actuarial gain (loss)		1,737,000	10,327,000	(612,000)
Other Comprehensive Income (Loss), Defined Benefit Plan, amortization of prior service cost		0	0	13,000
Other Comprehensive Income (Loss), Defined Benefit Plan, amortization of net actuarial loss		68,000	931,000	1,240,000
Other Comprehensive Income (Loss), Defined Benefit Plan, settlements		0	0	312,000
Other Comprehensive Income (Loss), Defined Benefit Plan, total pension liability adjustment, pre-tax		1,805,000	11,258,000	953,000
Other Comprehensive Income (Loss), Defined Benefit Plan, tax (expense) benefit		(390,000)	(2,431,000)	(204,000)
Other Comprehensive Income (Loss), Defined Benefit Plan, total pension liability adjustment, net	[1]	1,415,000	8,827,000	749,000
Components of Net Periodic Benefit Costs for Both Pension Plans
Defined Benefit Plan, service cost		3,706,000	4,652,000	4,455,000
Defined Benefit Plan, interest cost		3,200,000	2,314,000	2,089,000
Defined Benefit Plan, expected return on plan assets that reduces periodic pension benefit cost		(2,340,000)	(1,711,000)	(1,474,000)
Defined Benefit Plan, amortization of prior service cost		0	0	13,000
Defined Benefit Plan, amortization of net actuarial loss		68,000	931,000	1,240,000
Defined Benefit Plan, net periodic benefit cost		4,634,000	6,186,000	6,323,000
Defined Benefit Plan, settlements		0	0	312,000
Defined Benefit Plan, Total Net Benefit Cost		$ 4,634,000	$ 6,186,000	$ 6,635,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation and Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, discount rate		5.00%	5.20%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, rate of compensation increase		3.50%	3.50%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, discount rate		5.20%	3.10%	2.90%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, expected return on plan assets		6.30%	3.60%	4.40%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, rate of compensation increase		3.50%	4.80%	4.40%
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]
Defined Benefit Plan, Expected Future Contributions in Next Fiscal Year		$ 10,600,000
Future Benefit Payments
Defined Benefit Plan, Expected Future Benefit Payments in Year One		6,865,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Two		4,455,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Three		7,064,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Four		5,026,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Five		5,281,000
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter		$ 25,587,000
Fair Value Recurring Basis Unobservable Input Reconciliation Asset Gain Loss Statement Of Other Comprehensive Income Extensible List Not Disclosed Flag		Other Comprehensive Income (Loss), Defined Benefit Plan, total pension liability adjustment, net	Other Comprehensive Income (Loss), Defined Benefit Plan, total pension liability adjustment, net
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]		General and administrative	General and administrative	General and administrative
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		General and administrative	General and administrative	General and administrative
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		General and administrative	General and administrative	General and administrative
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		General and administrative	General and administrative	General and administrative
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		General and administrative	General and administrative
Nonqualified Plan
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, fair value of plan assets at beginning of year		$ 0	$ 0
Defined Benefit Plan, fair value of plan assets at end of year		$ 0	$ 0	$ 0
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation and Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, expected return on plan assets		0.00%	0.00%	0.00%
Defined Benefit Plan, Equity Securities
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, fair value of plan assets at beginning of year		$ 17,127,000
Defined Benefit Plan, fair value of plan assets at end of year		19,629,000	$ 17,127,000
Fixed Income Securities
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, fair value of plan assets at beginning of year		7,670,000
Defined Benefit Plan, fair value of plan assets at end of year		11,646,000	7,670,000
Other Securities
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, fair value of plan assets at beginning of year		11,617,000
Defined Benefit Plan, fair value of plan assets at end of year		$ 14,417,000	$ 11,617,000

[1] Please refer to Note 11 – Pension Benefits for additional discussion of the pension liability adjustment.