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Employee Benefits - Change in Benefit Obligations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
United Kingdom      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year $ 37,759 $ 32,906  
Service cost 124 112 $ 75
Interest cost 895 929 1,017
Plan participants' contributions 24 22  
Expenses 0 (8) 8
Benefits paid (3,049) (68)  
Actuarial (gain)/loss (3,844) 658  
Foreign currency exchange rate changes (1,864) 3,208  
Benefit obligation at end of year 30,045 37,759 32,906
Switzerland      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 5,927 6,928  
Service cost 138 243  
Interest cost 47 54  
Plan participants' contributions 83 120  
Benefits paid (77) (76)  
Actuarial (gain)/loss (372) (626)  
Foreign currency exchange rate changes (50) 303  
Settlement (409) (1,019)  
Prior service cost (8) 0  
Benefit obligation at end of year $ 5,279 $ 5,927 $ 6,928