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Retirement Plans - Information About Plan Assets (Details) - Pension Plan - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
United States |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | $ 3,792 | $ 4,767 | $ 4,459
United States | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 222 | 171 |
United States | Total fixed income funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 795 | 667 |
United States | Corporate bonds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 795 | 667 |
United States | Total mutual funds and equities |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 2,775 | 3,929 |
United States | Mutual funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 247 | 802 |
United States | Equity securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 2,528 | 3,127 |
United Kingdom |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 5,745 | 8,409 | $ 7,975
United Kingdom | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 540 | 339 |
United Kingdom | Bonds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 2,296 | 3,491 |
United Kingdom | Other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 379 | 757 |
United Kingdom | Equity securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | $ 2,530 | $ 3,822 |

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