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Earnings Per Share (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 31, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Numerator:
Net income	$ 17,100	$ 11,963	$ 17,560	$ 15,503	$ (14,758)	$ 6,781	$ 22,286	$ 24,319	$ 62,126	$ 38,628	$ 111,272
Denominator:
Weighted average number of common shares outstanding - Basic									18,696,659	19,367,928	19,327,394
Dilutive effect of options and restricted stock units outstanding under the Company's employee compensation plans									668,420	469,480	613,324
Weighted average number of common shares outstanding - Diluted									19,365,079	19,837,408	19,940,718

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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