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Retirement Plans and Related Post Retirement Benefits - Narrative (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($) retirement_plan | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Defined Benefit Plan Disclosure |  |  |
Number of non-qualified supplemental retirement defined benefit plans | retirement_plan | 2 |  |
Accumulated benefit obligation of the plans | $ 29,400,000 | $ 25,200,000 |
Fair value of plan assets at period end | 0 | 0 |
Unrecognized prior service costs, net | 2,400,000 |  |
Unrecognized prior service costs, tax | 600,000 |  |
Unrecognized actuarial losses | 9,800,000 |  |
Unrecognized actuarial losses, net | 11,400,000 |  |
Unrecognized actuarial losses, tax | 1,600,000 |  |
Net periodic pension cost | 300,000 |  |
Net periodic pension cost net of tax | 400,000 |  |
Net periodic pension cost, tax | 100,000 |  |
Actuarial loss | 1,000,000.0 |  |
Actuarial loss, net of tax | 1,300,000 |  |
Actuarial loss, tax | 300,000 |  |
SERP |  |  |
Defined Benefit Plan Disclosure |  |  |
Unrecognized prior service costs | 1,800,000 |  |
Current accrued pension liability | 300,000 |  |
Long-term accrued pension liability | 31,400,000 |  |
Expected future payments in 2021 (less than for SERP Medical) | 300,000 |  |
Expected future payments in 2022 (less than for SERP Medical) | 300,000 |  |
Expected future payments in 2023 (less than for SERP Medical) | 300,000 |  |
Expected future payments in 2024 (less than for SERP Medical) | 700,000 |  |
Expected future payments in 2025 (less than for SERP Medical) | 600,000 |  |
Benefits to be paid in the aggregate for the following five years | 6,800,000 |  |
Net periodic benefit cost | 2,093,000 | 1,783,000 | $ 2,114,000
SERP Medical |  |  |
Defined Benefit Plan Disclosure |  |  |
Current accrued pension liability | 100,000 |  |
Long-term accrued pension liability | 1,100,000 |  |
Change in retirement benefit obligation | 1,100,000 | 1,100,000 |
Net periodic benefit cost | $ 100,000 | 100,000 | 100,000
Percentage of fund | 92.00% |  |
Contribution of employer | $ 500,000 | $ 1,100,000 | $ 1,100,000
Total employer contribution | 1.00% | 1.00% | 1.00%

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