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Retirement Plans - Schedule of Expected Benefit Payments (Details) - United Kingdom Subsidiary - UK Plan
$ in Thousands
Dec. 31, 2020
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 11,036
2022 11,356
2023 11,684
2024 12,021
2025 12,370
Succeeding five years $ 67,423