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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.

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- Definition Gain and loses in excess of 10% of the greater of the projected benefit obligation or fari value of plan assets will be amortized over the average remaining service period + References No definition available. + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480266/715-60-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(6) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-6 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of benefit for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of benefit for defined benefit plan expected to be paid in next fiscal year following current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of benefit for defined benefit plan expected to be paid in fifth fiscal year following current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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