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SHAREHOLDERS' EQUITY (Narrative) (Details) $ / shares in Units, $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2015 USD ($) $ / shares | Dec. 31, 2017 ₪ / shares | Jan. 10, 2017 USD ($) | Dec. 31, 2016 ₪ / shares | Dec. 31, 2011 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized compensation expense related to non-vested stock options and restricted stock unit | $ 92,650 |  |  |  |  |  |
Unrecognized compensation expense related to non-vested stock options and restricted stock unit, expected to be recognized, years | 4 years |  |  |  |  |  |
Cash dividend paid, per share | $ / shares | $ 0.16 | $ 0.64 | $ 0.64 |  |  |  |
Ordinary shares, par value | ₪ / shares |  |  |  | ₪ 1.00 |  | ₪ 1.00 |
Maximum [Member] | Treasury shares [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  | $ 150,000 |  | $ 100,000
2016 Stock Option Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Price of options, as a percent of fair market value of ordinary shares | 1.83% |  |  |  |  |  |
Options and resticted share granted | shares | 1,099,141 |  |  |  |  |  |
American Depositary Shares [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Ordinary shares, par value | ₪ / shares |  |  |  | ₪ 1.00 |  |  |
Employee Stock Option [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Weighted-average grant-date fair value, options granted | $ / shares | $ 61.54 | $ 46.24 | $ 32.58 |  |  |  |
Total intrinsic value, options exercised | $ 42,592 | $ 35,664 | $ 40,519 |  |  |  |

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