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SHAREHOLDERS' EQUITY (Schedule of Intrinsic and Fair Values of Options Exercised) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Stockholders' Equity Note [Abstract] |  |  |
The intrinsic value of options exercised | $ 26,031 | $ 40,314 | $ 15,374
The original fair value of options exercised | $ 7,202 | $ 16,711 | $ 3,721

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- Definition The fair value of options exercised during the period. + References No definition available. + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- References No definition available. + Details
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