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Employee Benefit Plans (Additional Information) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2020
401(k)/Profit Sharing Plan |  |  |  |
Contribution match, as a percentage of annual pay | 4.00% |  |  |
Contribution matches, percentage of pre-tax compensation | 3.00% | 3.00% | 3.00% |
Expenses under the 401(K)/Profit Sharing plan | $ 2,400 | $ 2,300 | $ 2,300 |
Supplemental Executive Retirement Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Minimum guaranteed benefit term | 15 years |  |  |
Accumulated benefit obligation | $ 14,200 | $ 12,100 |  |
Other Postretirement Benefits Plan [Member] | Minimum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Health care cost trend rate assumed for future years | 4.50% | 5.00% | 5.00% |
Other Postretirement Benefits Plan [Member] | Maximum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Health care cost trend rate assumed for future years | 7.00% | 6.00% | 6.00% |
Scenario, Forecast | Supplemental Executive Retirement Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expected amortization of net actuarial loss |  |  |  | $ 623
Scenario, Forecast | Other Postretirement Benefits Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expected amortization of net actuarial loss |  |  |  | 78,000
Expected amortization of prior service cost |  |  |  | $ 24

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