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Pension and Other Post Retirement Benefit Plans - Schedule of Plan Assets by Level (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | $ 88,512 | $ 85,121 | $ 76,736
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 85,007 | 80,689 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash & Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 2,361 | 2,578 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate Bonds and Notes |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 16,330 | 17,629 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Government Agency and Municipal Bonds and Notes |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Certificates of Deposit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Common Stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 2,263 | 2,516 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Taxable Bond |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 17,676 | 13,938 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Large Cap Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 25,117 | 21,958 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mid Cap Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 10,731 | 10,407 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Small Cap Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 4,867 | 5,753 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | International Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 3,912 | 3,898 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Specialty Alternative Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 1,750 | 2,012 |
Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 3,505 | 4,432 |
Significant Other Observable Inputs (Level 2) | Cash & Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Corporate Bonds and Notes |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Government Agency and Municipal Bonds and Notes |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 2,462 | 3,660 |
Significant Other Observable Inputs (Level 2) | Certificates of Deposit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 1,043 | 772 |
Significant Other Observable Inputs (Level 2) | Common Stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Taxable Bond |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Large Cap Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Mid Cap Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Small Cap Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Significant Other Observable Inputs (Level 2) | International Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Specialty Alternative Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Cash & Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Corporate Bonds and Notes |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Government Agency and Municipal Bonds and Notes |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Certificates of Deposit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Common Stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Taxable Bond |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Large Cap Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Mid Cap Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Small Cap Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | International Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Specialty Alternative Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 88,512 | 85,121 |
Fair Value | Cash & Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 2,361 | 2,578 |
Fair Value | Corporate Bonds and Notes |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 16,330 | 17,629 |
Fair Value | Government Agency and Municipal Bonds and Notes |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 2,462 | 3,660 |
Fair Value | Certificates of Deposit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 1,043 | 772 |
Fair Value | Common Stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 2,263 | 2,516 |
Fair Value | Taxable Bond |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 17,676 | 13,938 |
Fair Value | Large Cap Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 25,117 | 21,958 |
Fair Value | Mid Cap Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 10,731 | 10,407 |
Fair Value | Small Cap Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 4,867 | 5,753 |
Fair Value | International Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 3,912 | 3,898 |
Fair Value | Specialty Alternative Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | $ 1,750 | $ 2,012 |

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