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Retirement Plans - Information About Plan Assets (Details) - Pension Plan - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
United States |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan asset | $ 4,360 | $ 12,468 | $ 14,892
United States | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan asset | 817 | 355 |
United States | Total fixed income |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan asset | 1,336 | 3,521 |
United States | Corporate bonds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan asset | 1,336 | 3,521 |
United States | Total mutual funds and equities |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan asset | 2,207 | 8,592 |
United States | Mutual funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan asset | 694 | 1,881 |
United States | Equity securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan asset | 1,513 | 6,711 |
United Kingdom |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan asset | 7,290 | 6,347 | $ 6,904
United Kingdom | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan asset | 516 | 685 |
United Kingdom | Bonds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan asset | 3,735 | 2,866 |
United Kingdom | Other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan asset | 949 | 795 |
United Kingdom | Equity securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan asset | $ 2,090 | $ 2,001 |

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