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Earnings Per Share (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 31, 2015	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Numerator:
Net income	$ 20,829	$ 19,850	$ 23,515	$ 23,278	$ 17,100	$ 11,963	$ 17,560	$ 15,503	$ 87,472	$ 62,126	$ 38,628
Denominator:
Weighted average number of common shares outstanding - Basic									18,931,415	18,696,659	19,367,928
Dilutive effect of options and restricted stock units outstanding under the Company's employee compensation plans									118,100	668,420	469,480
Weighted average number of common shares outstanding - Diluted									19,049,515	19,365,079	19,837,408

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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