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SHAREHOLDERS' EQUITY (Schedule of Share Option Activity) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Number of share options
Outstanding as of beginning of year	2,278,089	5,878,270	7,537,219
Granted		207,890	100,000
Exercised	(1,611,489)	(3,649,754)	(1,620,056)
Terminated	(77,292)	(97,063)	(26,777)
Forfeited	(9,123)	(61,254)	(112,116)
Outstanding as of end of year	580,185	2,278,089	5,878,270
Options exercisable as of end of year	459,662	1,606,983	2,606,704
Weighted average exercise price
Outstanding as of beginning of year	$ 9.92	$ 6.84	$ 6.37
Granted	0.00	12.19	16.92
Exercised	9.27	4.82	4.94
Terminated	25.89	21.34	22.28
Forfeited	8.06	7.25	8.30
Outstanding as of end of year	9.64	9.92	6.84
Options exercisable as of end of year	$ 8.51	$ 10.19	$ 8.93

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

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-Publisher FASB
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-SubTopic 10
-Section 50
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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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