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SHAREHOLDERS' EQUITY (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Feb. 29, 2016
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Feb. 12, 2020
Jan. 10, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of consecutive calendar days preceding option grant date used in calculating the average closing price of one american depository share 30 days          
Unrecognized compensation expense related to non-vested stock options and restricted stock unit   $ 131,459        
Unrecognized compensation expense related to non-vested stock options and restricted stock unit, expected to be recognized, years   4 years        
Cash dividend paid (in usd per share)   $ 0 $ 0.00 $ 0.16    
Dividends declared (in usd per share)   $ 0 0.00 0.16    
Treasury Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock repurchase program, authorized amount           $ 150,000
Treasury Stock | Subsequent Event            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock repurchase program, authorized amount         $ 200,000  
2016 Share Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of stock options exercisable after one year from grant date 25.00%          
Percentage of stock options exercisable, quarterly 6.25%          
Vesting period 3 years          
Percentage of restricted share units that vest annually 25.00%          
Expiration period 6 years          
Percentage of entity's issued and outstanding share capital used to determine maximum number of shares subject to awards granted 3.00%          
Options and restricted shares granted (in shares)   914,194        
Price of options, as a percent of fair market value of ordinary shares   1.48%        
Employee Stock Option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options and restricted shares granted (in shares)   368,375        
Weighted-average grant-date fair value, options granted (in usd per share)   $ 121.21 $ 89.54 $ 61.54    
Total intrinsic value, options exercised   $ 87,872 $ 68,749 $ 42,592    
Performance Shares | 2016 Share Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Expiration period 7 years