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Employee Benefits - Annual Benefit Payments (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
United Kingdom  
Defined Benefit Plan Disclosure [Line Items]  
2019 $ 295
2020 311
2021 383
2022 412
2023 403
Years 2024 - 2028 3,451
Switzerland  
Defined Benefit Plan Disclosure [Line Items]  
2019 678
2020 212
2021 209
2022 204
2023 199
Years 2024 - 2028 $ 908