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Pension and Other Post Retirement Benefit Plans - Narrative (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Mar. 01, 2005 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Percentage of employees covered by plan |  | 10.00% |  |
Minimum participant attained age | 55 years |  |  |
Requisite service period (at least) | 10 years |  |  |
Decrease in funded status |  | $ 625,000 |  |
Accumulated other comprehensive loss, net of tax |  | $ 1,700,000 |  |
Decrease in discount rate |  | 0.90% |  |
Discount rate |  | 2.30% | 3.20% | 4.30%
Increase in liability |  | $ 6,800,000 |  |
Liability reduction for mortality table updates |  | 700,000 |  |
Actual return on plan assets |  | 7,925,000 | $ 12,972,000 |
Increase from expected return |  | 3,800,000 |  |
Accumulated benefit obligation |  | 80,800,000 | 76,800,000 |
Net periodic pension benefit cost |  | (1,419,000) | (909,000) | $ (1,693,000)
Minimum required contribution in next fiscal year |  | $ 0 |  |
Requisite service period |  | 1000 hours |  |
Employer percentage contribution |  | 2.00% |  |
Vesting period |  | 5 years |  |
Expense recognized in the period |  | $ 5,100,000 | 4,600,000 | 5,100,000
Fair value of plan assets |  | 88,512,000 | 85,121,000 | 76,736,000
Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 85,007,000 | 80,689,000 |
Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | $ 3,505,000 | 4,432,000 |
MBT |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Requisite service period (at least) |  | 5 years |  |
Defined benefit plan, benefit obligation |  | $ 3,500,000 |  |
Post retirement plan expense |  | $ 126,000 | $ 43,000 |
Contribution for first 3% |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Amount of discretionary contributions made by employer to defined contribution plan, percent |  | 100.00% |  |
Maximum annual contribution percentage per employee |  | 3.00% |  |
Contribution after first 3% |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Amount of discretionary contributions made by employer to defined contribution plan, percent |  | 50.00% |  |
Maximum annual contribution percentage per employee |  | 3.00% |  |
Minimum | MBT |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Age of plan participants |  | 55 years |  |
Minimum | Debt securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Maturities of debt securities |  | 15 days | 15 days |
Maximum | MBT |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Age of plan participants |  | 65 years |  |
Maximum | Debt securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Maturities of debt securities |  | 6 years 8 months 8 days | 7 years 8 months 1 day |
Weighted Average | Debt securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Maturities of debt securities |  | 3 years 7 months 24 days | 4 years |
Non-qualified plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic pension benefit cost |  | $ 165,000 | $ 192,000 | $ 161,000

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