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Employee Benefits - Amounts Recognized in Accumulated Other Comprehensive Income not yet Recognized (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Total $ 3,000 $ 5,855  
United Kingdom      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial loss 4,254 7,138 $ 7,123
Total 4,254 7,138 7,123
Switzerland      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial loss (1,254) (1,283) (1,218)
Total $ (1,254) $ (1,283) $ (1,218)