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Employee Benefit Plans - Defined Benefit Pension Plann (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Benefit obligation assumptions      
Discount rate ( as a percentage) 0.75% 0.75%  
Rate of compensation increase ( as a percentage) 2.25% 2.00%  
Expected return on plan assets (as a percentage) 0.75% 0.75%  
Periodic benefit cost assumptions      
Discount rate ( as a percentage)   0.75%  
Rate of compensation increase ( as a percentage)   1.50%  
Expected return on plan assets (as a percentage) 0.75% 0.75%  
Changes in the obligations      
Benefit obligation, beginning of the year $ 37,584 $ 23,787  
Employer Service cost 4,450 2,836 $ 1,225
Interest cost 278 190 76
Plan participants contributions 1,282 1,101  
Actuarial loss 698 4,514  
Plan change   1,430  
Benefit payments from fund 2,268 2,853  
Expenses paid from assets 51 36  
Translation (gain) loss (471) 909  
Benefit obligation, end of the year 46,038 37,584 23,787
Changes in plan assets      
Fair value of plan assets, beginning of year 24,191 16,699  
Actual return on plan assets 95 88  
Employer contributions 3,133 2,891  
Plan participants contributions 1,282 1,101  
Benefit payments from fund 1,910 2,853  
Expenses paid from assets 51 36  
Translation gain (loss) (192) 595  
Fair value of plan assets, end of year 30,368 24,191 $ 16,699
Unfunded liability, end of year 15,670 13,393  
Accumulated benefit obligation $ 39,800 $ 33,100  
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%