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Employee Benefits - Net Periodic Pension Benefit Cost Assumptions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
United Kingdom      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 2.50% 2.70% 4.00%
Rate of compensation increase 3.70% 3.90% 3.70%
Expected rate of return on plan assets 2.00% 2.10% 3.00%
Other comprehensive income      
Actuarial (gain)/loss - benefit obligation $ (3,844) $ 658 $ 10,057
Actuarial loss/(gain) – plan assets 1,208 (393) (5,215)
Actuarial gain recognized in net periodic benefit cost (248) (250) 0
Other Comprehensive Income (Loss), Defined Benefit Plan, Transition Asset (Obligation), Reclassification Adjustment from AOCI, after Tax $ (2,884) $ 15 $ 4,842
Switzerland      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 0.80% 0.75% 0.95%
Rate of compensation increase 2.00% 2.00% 2.00%
Expected rate of return on plan assets 0.80% 0.75% 0.95%
Other comprehensive income      
Actuarial (gain)/loss - benefit obligation $ (372) $ (626) $ (1,157)
Actuarial loss/(gain) – plan assets 240 296 (1,233)
Prior service credit recognized in net periodic benefit cost 93 215 136
Actuarial gain recognized in net periodic benefit cost 69 43 (22)
Amortization of net prior service credit 8 8 8
Net prior service cost occurring during the year (9) (1) (89)
Other Comprehensive Income (Loss), Defined Benefit Plan, Transition Asset (Obligation), Reclassification Adjustment from AOCI, after Tax $ 29 $ (65) $ (2,357)