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Retirement Plans - Schedule of Expected Benefit Payments (Details) - United Kingdom Subsidiary - UK Plan
$ in Thousands
Dec. 31, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 14,599
2019 15,031
2020 15,474
2021 15,930
2022 16,401
Succeeding five years $ 89,566