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Retirement Plans, Pension Plan Assets (Details) - Pension Plan [Member] - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | $ 32,982 | $ 35,676 | $ 31,776
Level 1 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 8,037 | 7,831 |
Level 2 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 24,945 | 27,845 |
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 | 7,033 | 6,565 |
Domestic [Member] | Level 1 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 7,033 | 6,565 |
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 | 79 | 97 |
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 | 79 | 97 |
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 | 25,732 | 28,911 |
International Fixed Income Funds [Member] | Level 1 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 889 | 1,190 |
International Fixed Income Funds [Member] | Level 2 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 24,843 | 27,721 |
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 | 138 | 103 |
Other Investments [Member] | Level 1 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 115 | 76 |
Other Investments [Member] | Level 2 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | 23 | 27 |
Other Investments [Member] | Level 3 [Member] |  |  |
Pension Plan Assets by Asset Category [Abstract] |  |  |
Total assets at fair value | $ 0 | $ 0 |

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