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EARNINGS (LOSS) PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Numerator for basic and diluted net earnings (loss) per share:
Net income (loss)	$ (8,659)	$ 18,569	$ 24,950
Weighted average shares outstanding, net of treasury stock:
Denominator for basic net earnings (loss) per share	43,868,221	45,895,321	45,308,554
Effect of dilutive securities:
Employee stock options		843,283	1,586,061
Denominator for diluted net earnings (loss) per share	43,868,221	46,738,604	46,894,615
Basic net earnings (loss) per share	$ (0.20)	$ 0.40	$ 0.55
Diluted net earnings (loss) per share	$ (0.20)	$ 0.40	$ 0.53

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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