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Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Oct. 02, 2011	Sep. 30, 2012	Oct. 02, 2011
Computation of basic and diluted earnings per common share
Net income	$ 8,169	$ 5,817	$ 10,883	$ 11,682
Weighted-average shares of common stock outstanding:
Basic	21,325	21,689	21,413	21,660
Dilutive effect of common stock equivalents arising from share option , non vested share and non vested share unit awards	155	102	175	214
Diluted	21,480	21,791	21,588	21,874
Basic earning per share	$ 0.38	$ 0.27	$ 0.51	$ 0.54
Diluted earning per share	$ 0.38	$ 0.27	$ 0.50	$ 0.53

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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