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Employee Benefits - Pension Plan Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets at Fair Value | $ 122,344 | $ 116,652 | $ 101,765
Fair Value Measurements, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets at Fair Value | 122,344 | 116,652 |
Fair Value Measurements, Recurring | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets at Fair Value | 1,563 | 1,831 |
Fair Value Measurements, Recurring | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets at Fair Value | 108,583 | 101,320 |
Fair Value Measurements, Recurring | Equity index mutual funds - international |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets at Fair Value | 3,332 | 3,066 |
Fair Value Measurements, Recurring | Domestic individual equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets at Fair Value | 8,866 | 10,435 |
Fair Value Measurements, Recurring | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets at Fair Value | 122,344 | 116,652 |
Fair Value Measurements, Recurring | Level 1 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets at Fair Value | 1,563 | 1,831 |
Fair Value Measurements, Recurring | Level 1 | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets at Fair Value | 108,583 | 101,320 |
Fair Value Measurements, Recurring | Level 1 | Equity index mutual funds - international |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets at Fair Value | 3,332 | 3,066 |
Fair Value Measurements, Recurring | Level 1 | Domestic individual equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets at Fair Value | 8,866 | 10,435 |
Fair Value Measurements, Recurring | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets at Fair Value | 0 | 0 |
Fair Value Measurements, Recurring | Level 2 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets at Fair Value | 0 | 0 |
Fair Value Measurements, Recurring | Level 2 | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets at Fair Value | 0 | 0 |
Fair Value Measurements, Recurring | Level 2 | Equity index mutual funds - international |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets at Fair Value | 0 | 0 |
Fair Value Measurements, Recurring | Level 2 | Domestic individual equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets at Fair Value | 0 | 0 |
Fair Value Measurements, Recurring | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets at Fair Value | 0 | 0 |
Fair Value Measurements, Recurring | Level 3 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets at Fair Value | 0 | 0 |
Fair Value Measurements, Recurring | Level 3 | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets at Fair Value | 0 | 0 |
Fair Value Measurements, Recurring | Level 3 | Equity index mutual funds - international |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets at Fair Value | 0 | 0 |
Fair Value Measurements, Recurring | Level 3 | Domestic individual equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Assets at Fair Value | $ 0 | $ 0 |

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