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Employee Benefit Plans - Other (Details) - USD ($) |  | 3 Months Ended
--- | --- | ---
Mar. 22, 2021 | Mar. 31, 2021 | Mar. 31, 2020
Defined Benefit Plan Disclosure |  |  |
401(k) plan, percentage of employer match |  | 3.00% |
401(k) plan, maximum percentage contribution by employer |  | 6.00% |
Employer contribution | $ 1,000,000.0 |  |
SERP |  |  |
Defined Benefit Plan Disclosure |  |  |
SERP, accrued liability |  | $ 1,100,000 |
SERP, accrued expense |  | $ 97,000 | $ 80,000

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