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Retirement Plans, Pension Plan Assets (Details) - Pension Plan [Member] - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | $ 35,676 | $ 31,776 | $ 28,299
Level 1 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 7,831 | 7,351 |
Level 2 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 27,845 | 24,425 |
Level 3 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 0 | 0 |
Domestic [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 6,565 | 6,003 |
Domestic [Member] | Level 1 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 6,565 | 6,003 |
Domestic [Member] | Level 2 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 0 | 0 |
Domestic [Member] | Level 3 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 0 | 0 |
International [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 97 | 104 |
International [Member] | Level 1 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 0 | 0 |
International [Member] | Level 2 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 97 | 104 |
International [Member] | Level 3 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 0 | 0 |
International Fixed Income Funds [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 28,911 | 25,556 |
International Fixed Income Funds [Member] | Level 1 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 1,190 | 1,269 |
International Fixed Income Funds [Member] | Level 2 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 27,721 | 24,287 |
International Fixed Income Funds [Member] | Level 3 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 0 | 0 |
Other Investments [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 103 | 113 |
Other Investments [Member] | Level 1 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 76 | 79 |
Other Investments [Member] | Level 2 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 27 | 34 |
Other Investments [Member] | Level 3 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | $ 0 | $ 0 |

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