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THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES - Employee benefit Plan (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2020
Net periodic benefit cost        
Net periodic benefit cost $ 1,700 $ 1,100 $ 600  
U.S. Pension Benefits        
Pension plans with accumulated benefit obligations and projected benefit obligations in excess of plan assets        
Aggregated projected benefit obligation at end of period (1)(2) (115,900) (101,100)    
Aggregated fair value of plan assets at end of period 76,300 63,200    
Net (liability) asset for benefit cost - funded status (39,600) (37,900)    
Aggregated accumulated benefit obligation $ 115,900 $ 101,100    
Weighted-average assumptions used to determine net periodic benefit cost        
Discount rate (as a percent) 4.12% 3.42% 3.92%  
Weighted average expected long-term return on plan assets (as a percent) 6.70% 7.00% 7.00%  
Net periodic benefit cost        
Net periodic benefit cost $ 1,700 $ 1,100 $ 600  
U.S. Pension Benefits | Forecast        
Pension plans with accumulated benefit obligations and projected benefit obligations in excess of plan assets        
Aggregated projected benefit obligation       $ 5,100
International Pension Benefits        
Pension plans with accumulated benefit obligations and projected benefit obligations in excess of plan assets        
Aggregated projected benefit obligation at end of period (1)(2) (120,500) (98,600)    
Aggregated fair value of plan assets at end of period 119,400 107,200    
Net (liability) asset for benefit cost - funded status (1,100) 8,600    
Aggregated accumulated benefit obligation $ 117,200 $ 95,800    
Weighted-average assumptions used to determine benefit obligations        
Rate of compensation increase (as a percent) 2.19% 2.19% 2.14%  
Weighted-average assumptions used to determine net periodic benefit cost        
Discount rate (as a percent) 2.86% 2.58% 2.70%  
Weighted average expected long-term return on plan assets (as a percent) 2.99% 2.86% 2.85%  
Rate of compensation increase (as a percent) 2.19% 2.19% 2.14%  
International Pension Benefits | Forecast        
Pension plans with accumulated benefit obligations and projected benefit obligations in excess of plan assets        
Aggregated projected benefit obligation       $ 0
Pension Benefits | U.S. Pension Benefits        
Weighted-average assumptions used to determine benefit obligations        
Discount rate (as a percent) 3.07% 4.12%    
Pension Benefits | International Pension Benefits        
Weighted-average assumptions used to determine benefit obligations        
Discount rate (as a percent) 1.97% 2.86%    
Rate of compensation increase (as a percent) 2.27% 2.19%    
Weighted-average assumptions used to determine net periodic benefit cost        
Rate of compensation increase (as a percent) 2.27% 2.19%