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Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Oct. 01, 2011	Jul. 02, 2011	Apr. 02, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Numerator:
Net income	$ 19,786	$ 17,349	$ 18,014	$ 15,480	$ 10,518	$ 10,737	$ 10,813	$ 7,947	$ 70,629	$ 40,015	$ 28,255
Denominator:
Weighted average number of common shares outstanding - Basic									19,160,849	18,919,489	19,032,557
Dilutive effect of options and restricted stock units outstanding under the Company's employee compensation plans									474,392	232,909	266,636
Weighted average number of common shares outstanding - Diluted									19,635,241	19,152,398	19,299,193

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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.

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