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Retirement Plans - Information About Plan Assets (Details) - Pension Plan - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
United States |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | $ 4,459 | $ 4,360 | $ 12,468
United States | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 399 | 817 |
United States | Total fixed income funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 1,440 | 1,336 |
United States | Corporate bonds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 1,440 | 1,336 |
United States | Total mutual funds and equities |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 2,620 | 2,207 |
United States | Mutual funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 713 | 694 |
United States | Equity securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 1,907 | 1,513 |
United Kingdom |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 7,975 | 7,290 | $ 6,347
United Kingdom | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 348 | 516 |
United Kingdom | Bonds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 3,410 | 3,735 |
United Kingdom | Other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 1,116 | 949 |
United Kingdom | Equity securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | $ 3,101 | $ 2,090 |

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