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Retirement Plans - Schedule of Expected Benefit Payments (Details) - United Kingdom Subsidiary - UK Plan
$ in Thousands
Dec. 31, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 12,887
2021 13,240
2022 13,603
2023 13,976
2024 14,358
Succeeding five years $ 77,912