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Employee Benefit Plans - Defined Benefit Pension Plan (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Benefit obligation assumptions      
Discount rate ( as a percentage) 0.30% 0.75%  
Rate of compensation increase ( as a percentage) 2.25% 2.25%  
Expected return on plan assets (as a percentage)   0.75%  
Periodic benefit cost assumptions      
Discount rate ( as a percentage) 0.75%    
Rate of compensation increase ( as a percentage) 2.25%    
Expected return on plan assets (as a percentage) 0.75% 0.75%  
Changes in the obligations      
Benefit obligation, beginning of the year $ 46,038 $ 37,584  
Employer Service cost 5,195 4,450 $ 2,836
Interest cost 345 278 190
Plan participants contributions 1,613 1,282  
Actuarial loss 6,672 698  
Transfer of benefits net of payments from fund 2,184 2,268  
Expenses paid from assets 61 51  
Translation loss (gain) 784 (471)  
Benefit obligation, end of the year 62,770 46,038 37,584
Changes in plan assets      
Fair value of plan assets, beginning of year 30,368 24,191  
Actual return on plan assets 132 95  
Employer contributions 3,910 3,133  
Plan participants contributions 1,613 1,282  
Transfer of benefits net of payments from fund 2,184 1,910  
Expenses paid from assets 61 51  
Translation loss (gain) 516 (192)  
Fair value of plan assets, end of year 38,662 30,368 $ 24,191
Unfunded liability, end of year 24,108 15,670  
Accumulated benefit obligation $ 52,900 $ 39,800  
Minimum      
Periodic benefit cost assumptions      
Discount rate ( as a percentage)   0.75%  
Rate of compensation increase ( as a percentage)   2.00%  
Maximum      
Periodic benefit cost assumptions      
Discount rate ( as a percentage)   1.00%  
Rate of compensation increase ( as a percentage)   2.25%