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Earnings Per Share (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jul. 02, 2017	Apr. 02, 2017	Dec. 31, 2016	Oct. 03, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Numerator:
Net income	$ 10,350	$ 9,370	$ 10,199	$ 22,224	$ 20,829	$ 19,850	$ 23,515	$ 23,278	$ 52,142	$ 87,472	$ 62,126
Denominator:
Weighted average number of common shares outstanding - Basic									17,725,494	18,931,415	18,696,659
Dilutive effect of options and restricted stock units outstanding under the Company's employee compensation plans									213,596	118,100	668,420
Weighted average number of common shares outstanding - Diluted									17,939,090	19,049,515	19,365,079

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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