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Benefit Plan (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Nov. 17, 2009
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  | $ 0 | $ 0 |  |
Defined Benefit Plan, Benefit Obligation |  | $ 127,394 | $ 182,964 | $ 184,410 |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate |  | 5.32% | 3.23% | 3.00% |
Expected long-term rate of return on plan assets |  | 6.92% | 6.92% |  |
Accumulated benefit obligation for the pension plan |  | $ 106,300 | $ 146,200 |  |
Common share purchased under pension plan, shares |  |  |  |  | 115,800
Common share purchased under pension plan, value |  |  |  |  | $ 7,000
Common share purchased under pension plan, value per share |  |  |  |  | $ 60.45
Fair value of common shares held by pension plan |  | $ 16,300 | $ 15,900 |  |
Fair value of common shares held by pension plan, per share |  | $ 140.75 | $ 137.31 |  |
Fair value, pension plan common shares held, shares |  | 115,800 | 115,800 |  |
Defined Benefit Plan, Plan Assets, Amount |  | $ 209,138 | $ 263,473 | $ 230,442 |
Defined Contribution Plan, Cost |  | 4,600 | 4,300 | $ 4,200 |
Subsequent Event [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer | $ 0 |  |  |  |
Level 1 |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 180,153 | 226,673 |  |
Level 2 |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 28,985 | 36,800 |  |
Supplemental Executive Retirement Plan (SERP) |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Accrued benefit cost |  | $ 14,200 | $ 13,400 |  |

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