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Benefit Plans - Fair Value of Plan Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 297,603 | $ 260,747
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 231,996 | 192,752
Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 65,607 | 67,995
Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Executive Supplemental Retirement Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 3,014 | 3,183
Executive Supplemental Retirement Plan | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 3,014 |
Executive Supplemental Retirement Plan | Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Executive Supplemental Retirement Plan | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Executive Supplemental Retirement Plan | Money market funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 83 | 20
Executive Supplemental Retirement Plan | Money market funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 83 |
Executive Supplemental Retirement Plan | Money market funds | Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Executive Supplemental Retirement Plan | Money market funds | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Executive Supplemental Retirement Plan | Mutual funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 2,101 | 834
Executive Supplemental Retirement Plan | Mutual funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 2,101 |
Executive Supplemental Retirement Plan | Mutual funds | Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Executive Supplemental Retirement Plan | Mutual funds | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Executive Supplemental Retirement Plan | Fixed income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 830 | 2,329
Executive Supplemental Retirement Plan | Fixed income | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 830 |
Executive Supplemental Retirement Plan | Fixed income | Significant Observable Inputs (Level 2) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Executive Supplemental Retirement Plan | Fixed income | Significant Unobservable Inputs (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 0 | $ 0

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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