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Pension and Other Post Retirement Benefit Plans - Schedule of Plan Assets by Level (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | $ 76,736 | $ 85,213 | $ 83,557
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 71,277 | 78,280 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash & Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 3,026 | 5,123 |
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 | 16,691 | 14,598 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Common Stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 2,073 | 2,545 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Taxable Bond |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 12,817 | 12,198 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Large Cap Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 18,269 | 22,137 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mid Cap Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 8,735 | 10,676 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Small Cap Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 4,713 | 5,264 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | International Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 3,336 | 4,030 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Specialty Alternative Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 1,617 | 1,709 |
Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 5,459 | 6,933 |
Significant Other Observable Inputs (Level 2) | Government Agency and Municipal Bonds and Notes |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 4,479 | 5,679 |
Significant Other Observable Inputs (Level 2) | Certificates of Deposit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 980 | 1,254 |
Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets |  |  |
Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 76,736 | 85,213 |
Fair Value | Cash & Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 3,026 | 5,123 |
Fair Value | Corporate Bonds and Notes |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 16,691 | 14,598 |
Fair Value | Government Agency and Municipal Bonds and Notes |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 4,479 | 5,679 |
Fair Value | Certificates of Deposit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 980 | 1,254 |
Fair Value | Common Stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 2,073 | 2,545 |
Fair Value | Taxable Bond |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 12,817 | 12,198 |
Fair Value | Large Cap Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 18,269 | 22,137 |
Fair Value | Mid Cap Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 8,735 | 10,676 |
Fair Value | Small Cap Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 4,713 | 5,264 |
Fair Value | International Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 3,336 | 4,030 |
Fair Value | Specialty Alternative Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | $ 1,617 | $ 1,709 |

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