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EARNINGS PER SHARE (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Numerator:
Net income	$ 9,370	$ 19,850	$ 41,793	$ 66,642
Denominator:
Weighted average number of common shares outstanding - Basic	17,590,341	18,971,854	17,826,137	18,961,146
Dilutive effect of options and restricted stock units outstanding under the Company's employee compensation plans	222,232	232,321	192,038	204,731
Weighted average number of common shares outstanding - Diluted	17,812,573	19,204,175	18,018,175	19,165,877

X

- Definition

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

+ References

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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