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Expected Future Benefit Payments (Details) - UNITED KINGDOM
$ in Thousands
Dec. 31, 2016
USD ($)
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]  
2017 $ 875
2018 725
2019 1,048
2020 1,205
2021 1,371
2022-2026 7,667
Total $ 12,891