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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 |  |  |  |  |

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